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Not sure what would be the best route to go, but (I think the Solitaire is AAA? twisty incandescent right?) if you find a light that uses the same battery size, you could probably find a compatible driver. If 10mm will fit, MTN Electronics has some misc 10mm drivers on his site (I’m sure you could find similar small drivers around in the usual places).
I have seen some deals on the Lumintop Tool AA and AAA in the amazon deals thread here on BLF. I’m not sure if they are still active, but I got a AA tool for like $6 and it is a pretty good light. From what I can see, it may be possible to get the driver out of it without too much damage. I think there is a sub brand/cousin of the AAA version named “Ultratac A7”. The Ultratac A7 doesn’t appear to be an easy one to pull apart, but if you are careful you may be able to cut the innards out. As far as my experience goes, most of the AAA sized lights are full of glue/solder/etc and hard to mod/disassemble.
There will be custom work no matter which way you go, so if you can get a driver the right size without having to dismantle a tiny and difficult light, you will probably be ahead in labor costs.
I haven’t looked for small LED boards before, but I’m sure they exist. I’ve modded 2 Maglites so far, a AA Mini Maglite (cut it down to 1AA size and put in a triple board with 5000k nichia 219c’s with a FET driver), and a 3D Maglite (buck driver, 3x 26650, XHP70.2 emitter). I have since purchased some ready made lights (D4s, Q8, FW3A, Convoy S2, Convoy C8, etc) and I like many of them more than the modded lights (that extra-mini mag is awesome though). Doubly so if you count the cost of the modded ones vs something like the FW3A.
If this is purely for sentimental reasons, why not keep it as is? You could run rechargeable NiMHs in it for slightly better performance and maybe they make an easily swap-able LED for it. (found one on ebay with a little searching) A small single cell light like that with non-leaky batteries is nice for a car light or in an emergency/first aid kit