I have a bubble inclinometer on my handle bar for touring, it makes it easier to compare one hill to the next.

And I have bad knees, I have not pedaled out of the saddle for over a decade, the last time I did that I blew out a knee and walked with a slight limp for almost a year.

I hope your tendon recovers in a reasonable period of time.

I wonder if that tendon has less stress on it if shoe cleats are moved further back on the shoe? I find I no longer have sore feet with my cleats further back, that might help your tendon too?