I have given the Trento Bike pages a thorough search and they do have one or two travelogues in the Venice to Pisa area. There are probably more but I can't read German, Italian, etc...only English for me. I have also searched many other sites...I have been researching my trip for over 20 months.
I am thinking maybe I might spend more time in Hungary/Slovakia/Czech Republic earlier in my tour and just catch the train from Venice to Pisa. Will see what suggestions I get.
Thanks
Mat