Best way to remove Aluminium from "silvered" glass?
Heating the bulb in a dilute NaOH solution would probably work, yes. Something that might be more 'interesting', and potentially safer (with less hydrogen) though, is to acquire a bit of gallium.

Gallium infiltration is a really fascinating phenomenon. Simply melt a little bit of gallium and dunk your bulb in it, and watch as the aluminum becomes as soft as wet tissue paper. Gallium also melts at a temperature very slightly above that of room temperature, meaning that the the chance of the glass bulb cracking because of heating would be very minimal.