I had an original purple GBA as a kid and I had a great time on it with ALTTP, Mario Kart, Breath of Fire, and so on, but it having an unlit screen was what eventually killed it for me— I wonder if it's still in a box somewhere in my parents'. There's hardly any point now with having an Odroid portable that plays all the same games, but it'd be neat to see it working again.
It would also rub me in the wrong way to use an aftermarket display instead of the one that came with the device, even if it wasn't so destructive.
I can honestly recommend buying another GBA and modding it. The panel is 4x upsampled, which brings a very cool look to many classic GBA games. It's also a fun experience hacking around in it.
I have it when playing GBA games on my Powkiddy RGB10 (also 480x320 native resolution), and I think it looks great, especially when compared to the 95 PPI display on my other handheld, a New 3DS XL.
Not surprisingly, others came up with plenty of mods to try to remedy it:
https://en.wikipedia.org/wiki/Afterburner_(modification_kit)