a bin-pin lamp is the easiest, but they will be a lot bigger, say like SFs bulbs.
but You got the real problems:
NOTHING at the front end can survive the heat.
Probably there can glass front lens, reflector, even a ceramic bulb holder (instead of the "switch") be found ... I think latter has been done here already?
There was also a kit with an aluminum reflector (NOT silver coated!) , a bulb holder like the one in the Aurora kit , a glass lens and a special bulb for 3 (maybe it was 4?) AA Alkaline batteries.
AND a body extender allowing the MiniMAG to accept 3 (or 4) AA batteries.
I remember seeing one of these once, a colleague here in Oslo had one.
Cannot find any links, but they did exist.
But this was almost before you could go on the Internet!
Big problem was that spare bulbs was not possible to get outside of the kit.