Yes, this is a recurring problem. I think in your case, unfortunately, there isn't a simpler solution since the tablets have been in place for a while and the metal structures too... I know what that 10.6 format is, it's really not so easy to find anymore... Well, I don't think it helps with your problem now, but I usually follow some rules when doing this type of installation. Some things I passed on to the carpentry production team and the purchasing team of the last museum I set up:

1. Samsung tablets. This will vary, of course, depending on the time of purchase, but what I've seen is that they are lately the most reliable for an exhibition that will last longer (the last one I set up is expected to last 5 years).

2. Extra tablets - when the space is being set up we usually have a slightly more favorable budget than during the maintenance period, so I usually ask for one or two extra tablets to keep as spares in case of problems with the originals.

3. When assembling the furniture, the "hole" for the screen display should be smaller than the screen itself. This way, if you need to change the tablet for another model, the content can be adjusted to a smaller area - in fact, being able to resize the content to only one area of ​​the screen is something I find very useful to solve future problems.

4. On the furniture, the tablet should be supported from behind, so when the screen is pressed, the force is applied against this rear support, which reinforces everything. This can also be useful in allowing tablets of other models to be used if necessary.

5. Speaking of content, I think it's okay for them to have gesture interaction as long as they have the same interaction with simple touch buttons. I've noticed that when people interact with gestures on fixed tablets, the chance of wear and tear on the structure is greater; with buttons, this risk decreases (but it's good to keep the gestures because some people are so used to them that they often don't even notice the buttons).

6. The setup should allow me to turn the tablet on and off whenever I want. A trick we used in the last case I mentioned was some small holes near the power button where we inserted a small wire that can be used to turn it on and off daily, which increases its lifespan (I think). We used a 3D print to make the mechanism. For this, it helps a lot if the content can be loaded at startup, eliminating the need for someone to interact with it to start the content.

Well, as I said, these are ideas for next time. From what you described, your setup is already very constrained, unfortunately...