New Knee Revision: Training

What kind of training schedule am I looking forward to this year?
This has become a very interesting question for me. I **was** planning on ramping up my regular cycling with a few longer rides in the mid year as goals in mind. Included was a  two day Seattle to Portland (almost 200 miles) and a Canadian Randonneurs DART (~200k). HOWEVER I recently found out that I get to go in to the Bone Doc at the end of February and have my knee prosthetic "revised"... So now my training goals have spin classes (No standing!) at least 3 times per week up to the surgery and then more than a month of rehab including indoor cycling until I get my range of motion back. By the end of March I think I should be able to be on the bike on the flats for up to maybe 10-20miles.
The big question will be whether I can still do the STP in July.... Which would mean I should be riding 80-100 mile rides at least 3-4 times in May & June. - I have a funny feeling I will end up driving support instead of riding.