I’ve had to reteach myself from scratch the year before last – got really bad tennis elbow (or the other one, Golfers – can’t recall) and couldn’t pull anything at all. Had to start with just bent arm isometric holds leaning back about 20 degrees and build up from that to slowly increase the tendon’s tolerance. Being old, it took nearly a year with several set backs, but now back to doing chin ups / pull ups fine.
The general advice I’ve seen in Cross Fit gyms for chin up regressions is start at the top and lower yourself down. Just stand on a box to get up there and then step off it once locked onto the bar.
I have the same problem with pull up bars and barbells, gives me golfers elbow due to needing to slightly over rotate my joint to grip the bar. I switched to a set of gym rings and an ez barbell which solved the issue.
Golfers elbow is the tendons attached to the bony bit on the inside of the joint, tennis elbow is the tendons on the outside of the joint.