Hi flanajb
You could use it and it will bond with epoxy or even contact adhesive (the original perspex adhesive was just basic contact stuff). There are a couple of issues though.
It will scratch and mark easily and even careless cleaning with a dry duster will create fine scratches though thay can be pelished out with care.
It will expand / contract at a different rate to the backing board which can cause problems with "rippling" or even delamination. You could use framed doors and loose fit which would allow the movement but that might not be the look you are aiming for.
If there is one, you should get prices also from a local distributor of semi-finished plastics - Amari Plastics are the largest national group. If there's a signmaker anywhere near they will tell you who supplies them. Apart from the proper "PERSPEX" brand ( ICI ) there are a number of other manufacturers, colour will be available and prices can vary widely. The trade can easily get 35% off list so you need to push.
There used to be a flourescent orange available btw which looked a solid colour on the face but the edges glowed. I might even have a sample somewhere if I could find it.
As an afterthought, we used to sell an aluminium/plastic/aluminium ply product in 3mm and could get orange satin or gloss finish. Can't remember the name or prices but it was used for display, shop fitting and external cladding panels. You might be able to get engraving sheet as well but likely more expensive.
Personally, I would use MDF/C and just spray it - much cheaper - especially if the boss doesn't like it :lol:
Bob