Hi Nadia, I am glad you found your friend GW.
Every 5 years or so we have an Australian Laverda Rally at our farm located 14k's out of Bellingen. The farm is accessed via a causeway over the Kalang river. We have another one planned for the end of Sept this year. Actually it was planned for last year but C19 put an end to that.
Crossing the causeway is normally not a problem but sometimes the weather gods have different ideas. The video Dellortoman mentioned is on this link
This was in 2009. About 2 weeks earlier the water was nearly 10m deep on that causeway. It is usually about 6 inches deep.
By the way I own two Guzzi smallblocks along with several Laverda's so there is definately no issues with turning up on a Guzzi!
As Vince stated I do not think the Laverda community is that exclusive to really care what bike someone turns up on. If its itallian then all the better.
Take care and I hope your catch up with your friend goes well.
Cheers
Bruce K