If sitting is a problem
…which I can understand - had a similar trouble after one surgery - then canoe is the only way to go, 'cause it allows kneeling. Or a hybrid stance when you kneel and then rest the butt on your heels. From a “spending expert’s” point of view - which I am probably not, 'cause don’t have much to spend 
- lightweight commercial canoe like Swift is easier to get. SOF canoes are less common than SOF kayaks these days.
Some things you can’t rush, yes. I had to limit most activities to just slow walking for a while. Thanks God, now it’s over.