Curious if you've had your appointment yet. I'm a cyclist, too, and have suffered from chondromalacia and peroneal nerve palsy, both of which I suspect is from PCL laxity. It took a couple of years before I figured out what was going on (several OSs, including one renowned one, never did) and started using bracing, so I managed to do more damage while cycling 5000+ miles a year. With bracing, I'm able to ride about 10,000 miles a year, but the bracing is a pain, and eventually, seems to be less effective.
Strong quads help with stability, but if your hamstrings are active on the upstroke,the tibia gets yanked backwards. I was able to cycle reasonably for about an hour unbraced before the leg just quit working. It's pretty disconcerting when it feels like your pernoneal nerve is going to quit working in the middle of a paceline (for me and for the poor fools stuck behind me).
Given the improving technique in PCL reconstruction, I'd consider it. When I tore things up over 10 years ago, bracing was the only option. My experience is that there is a risk of doing more damage with PCL laxity.