I have used regular lifting straps to deadlift before, but there are some issues there.
Using the straps, you lift literally only using the strap. What that means is when I deadlift 100kg, the strap rubs against/pushes into my skin with so much force that it really hurts, especially for reps.

Using them for pullups is something that I've also tried, but the issue is that even though the strap is hanging from a lower height than the bar so that when i catch it my elbows are aligned, once I start doing a pullup, I get to a point where I have reached the height of the strap, but not the height of the bar. To go further up, the only thing I can do is just pull with my right hand that's on the bar. In a nutshell, my left arm does the whole motion, but my right arm is just half way there, if that makes sense.

Thanks for your answer though! I can 99% of things with no difficulty. Dips, rowing, bench and most of the other stuff are of no concern and I have found a way to do them, but admittedly there are some exercises that are really good for certain muscles and that I haven't found a workaround for.

I'll look into inventing something myself for sure lol. If someone comes up with a genius idea down here, I'll put you on my patent.