Training Around a Bad Shoulder (Substitution Exercises)

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Sup /fit/
I have a chronic shoulder injury from a (non gym related) incident a few years back.

Damaged ligament and cartillage, had very frequent dislocations.

Had surgery a few months ago to stop it dislocating from everyday activities but it still remains very much a bad shoulder, seeing a physio and sports doc to see if some kind of rehab is possible.

Anyway, I started lifting a few months ago on StrongLifts and later ICF but realized pretty quickly that the shoulder was a problem on a lot of the lifts, so I started looking up substitution exercises to still be able to train in the mean time.

I can't hold the bar in position with any significant weight in the Back squat, so I replaced these with Hack Squats.

The hard limit for the normal grip bench press beyond which I get significant acute pain in the shoulder even with proper form is about 95 lbs.
I've since started doing close grip BP instead which doesn't seem to hurt the shoulder nearly as much.

Overhead press is out of the question, as I can't risk my arm dislocating at the top of a lift with a loaded bar behind my neck, and it causes a lot of acute pain.
I replaced this one with a Landmine press, which I've reached about 55kg on.

I know I'm basically butchering 3 of the most venerable lifts here (hey at least I'm not using machines), and my aim is to eventually be able to do them properly, how much gains do you think I'm missing out on this way and are there any assistance lifts I can do to make up for it ?

pic: Tits always related