I’ve trained around a torn/reconstructed ACL since Oct. I logged everything after surgery here
Not the same situation, but I was also unable to squat (at least one 2 legs) for a while there.
I’d consider single leg training to reduce the load on your back. Reverse bands would also be useful, as they’d lighten the load during the most vulnerable portion of the lift. Chains could have a similar effect too. The prowler would be an amazing movement, as there is minimal spinal loading but it will still hammer the everloving crap out of your legs, especially if you drag it backwards. You could also do belt squats. If you can do partials without pain, do a lot of those.
Really, if there is only 1 movement you can’t do, you’re in an awesome place with your training. There is SO much to do.