I quite literally feel your pain, options are limited, ive had right knee replaced & waiting on the left, but even replacement has its pitfalls, such as not being able to comfortably kneel on it, even with monster knee pads.
Cortosteroid injections can help but its limited & usually short lived, & there are restrictions on how many you can have as they can affect bone density etc.
Braces are difficult, ive tried numerous types & quite literally was searching online today for something new for my left leg.
Shows how our phones spy on us, im getting pop up ads showing motorised exoskeleton braces, that, if the ads are to be believed, will have me running up hills etc.
I'm sceptical lol 😏
Problem with a brace is if you're bone on bone, as I am, then ideally you need something to hold the two apart, to do that the upper & lower sections would have to be mega tight, probably cutting off circulation, not a good thing ?.
Pain meds might help, ideally stuff like gabapentin, non addictive & wont have you swerving all over the place on the drive home.
There's no perfect solution, keeping weight down & fitness up is probably on of the best answers, but again both can be difficult in our twilight years.
Good luck 🙏