Just trying to get your Tassie route into my head ...
Day 4:
tinyurl.com
Day 5:
www.google.com.au
You seem to be doing a bit of backtracking. There might be a better way to plan it without re-tracing some of the same roads.
I think the road to Lake Margaret is unsealed.
Day 6:
www.google.com.au
Oil change at Cam's place eh? That's a bit presumptuous.

It's a few months away, so that should just be enough time to tidy the shed up if I start now.
BTW Marty, I still have a 4-litre container of Penrite Enduro that you bought for a trip that didn't happen (because of Covid), so don't buy any more oil.
I also have an unopened 4-litre container of Penrite MC4ST mineral oil. I think I bought it for someone on that same trip that got cancelled but didn't ask them to pay for it because I'd use it myself eventually (which I haven't yet because I already had heaps of the stuff). So I think it's mine, but I'm not 100% sure. If my memory of events is incorrect and one of you guys did pay for it, please say so.
I checked with Penrite. Their engine oils have a shelf life of 5 years. The only thing that's likely to render them out of date is if a better oil has been developed in the meantime. I don't think Penrite has changed their motorcycle mineral oil specifications since they came out with Enduro.
Day 7:
There's so many options.
Even with your Southport destination there's a bunch of alternative routes.
www.google.com.au
The Strathgordon option:
From Bushy Park to Strathgordon, there's only one route there and back.
Between Hobart and Bushy Park there's a few alternative routes.
www.google.com.au
I may be able to join you on a day ride out of Hobart, but I dunno whether I'd take the Jota. My back and knees aren't so keen on the clip-ons and rear-sets these days. I would probably choose something more comfortable like the Benelli Tre-K or the Multistrada. Depends on the destination, and how I feel on the day I suppose.
Day 8:
St Marks? I assume that's a typo and you mean St Marys. I'm not aware of a St Marks in Tasmania.
A nice ride and the best route if the weather is looking at all dodgy from the west.
www.google.com.au
If any of you aren't feeling like doing the extra miles of the detour into Campbell Town, the route straight up the coast is pretty nice and you can meet up with the iron butt guys at the destination.
The detour into Campbell Town and back to the coast via Fingal is nice enough and the roads are good, but it doesn't really have a lot going for it compared to what you've already seen of Tassie. If it was my choice, I wouldn't bother.
Another option for those who like the twisties but don't wanna do the mileage of the Campbell Town detour, stay on the coast road at the Lake Leake turnoff, then do a detour to St Marys via Elephant Pass, then back down to meet the coast road again near Falmouth.
This is what I mean:
www.google.com.au
Or:
Your suggested alternative ...
www.google.com.au
It can get cold and miserable up on the plateau in bad weather. Even just in low cloud cover. But it's a brilliant route on a nice day. Excellent sealed road over the plateau, but almost devoid of traffic for some reason. Might be best to decide on the day which way to go, depending on weather.
I've added a side trip from Nunamara in case Vince wants to do the Mt. Barrow road.
I've heard that the Weldborough pub has changed hands and aint what it used to be. I'll do a bit more asking around on this and get back to you.
Pub in the Paddock at Pyengana might be a better option. Decent but reasonably priced accommodation (including camping). Excellent restaurant and Priscilla the pig who'll guzzle a stubby of beer in seconds.
Day 9:
www.google.com.au
Unless any of you have a reason to go into Launceston, I'd suggest you avoid it. It's just major highways and traffic.
Try this:
www.google.com.au
Also has the Mt. Barrow road opportunity.
Don't forget that if anything goes wrong, I'm available with a bike trailer to retrieve a busted bike and rider from anywhere, although it could take most of the day to get there if you're at the other end of the state from me. A few of you have my phone number.
Another option if you're in the Northern part of Tassie is Carolynn at Tasmanian Motorcycle Transport, 0401 160 144. She's based in Devonport and will do crash or breakdown recovery. She specialises in getting bikes across Bass Strait. Handy if you want to get a dead bike back to the North Island and you can't do what we did on the ferry last time with Chris's bike.
Cheers,
Cam