Update: 12 months post TKR
It is now 12 months since I underwent TKR. During the summer, I completed two multi-day tours on the bike. I still use fat pedals, as I don't feel comfortable with clip-in pedals.
The knee got stronger and more flexible after each tour. At the end of the month, I am going to Taiwan to cycle around the island (960 km). I'll let you know how it went.