So I did some work on this front.
I bought a flat plate mount that has a 200x200 vesa wall mount. This particular mount seems to have 200x200, 100x100 and 75x75 available on both "sides" of the plate.
This means minimal modification necessary for whatever monitor you end up with.
Unless you choose to drill your cabinet's monitor support piece (which probably nobody wants to do, or else why even bother with the plate), this plate needs new holes to mount to the stock backing of a real vewlix. I took the bottom two holes of the 200x200 pattern on the plate, mounted it temporarily, then marked the 200x100 hole locations on the vewlix back onto the plate. I then drilled new holes in the marked spot, and inserted rivet nuts to make life easier.
Now you are free to mount any monitor of your choice that has a
centered VESA bolt pattern (more drilling of the plate if you have a stupid monitor with a non-centered mount).
I don't have a nice 32 inch panel yet so I used an old dell monitor to test but you get the idea.
The real problems that remain are:
1. The black surrounds from the original monitor cannot mount to your new panel due to them originally mounting by screwing INTO the monitor edge.
To experiment, I took the long surrounds and used screws, one on each side, in the existing holes to mount to the speaker boxes. While not ideal, it is minimal modification to the box and seems acceptably secure. This is likely the route I will take when the time comes.
The side (shorter) pieces have no easy way to mount like the long pieces, but I can think of a few options, one being double sided tape to the side plastic panel of the cabinet.
Option 2 is to simply leave them off as it is barely visible with the side plastic on anyway.
Third option is to drill the surrounds and attach them all together with L brackets (worst option of the three, I think).
2. The final problem, as I mentioned earlier, is that the replacement panel, whatever it is, will likely not be as deep as the original monitor as many consumer panels are really thin now.
In the case of this random test display, the gap was approximately 2cm
This gap will depend on your specific monitor choice, but I think the best way to deal with this is to create acrylic (or some other reasonably strong material) spacers that mount between the cabinet and the plate (rather than the monitor side to avoid excessiveflex). You'll just need to experiment with your specific configuration.