Original flash bulbs aren't all that rare -- last time I looked, they were pretty easy to find on eBay (maybe Etsy too, these days). There are several kinds, however; the bayonet style (base like an old style incandescent tail light bulb), the push-in "M" style, and the "AG" ("all glass") type with no applied metal base. I can't tell for certain from the photo which kind your Ikoblitz unit takes.
I'm not aware of any electronic flash units that plug into a flash bulb socket like the one in that reflector, however -- the first of those that I recall were for FlipFlash or Flashbar (late Kodak Pocket Instamatic and Polaroid SX-70 family, respectively); instead, there were and are many different electronic flashes that would mount in the same "hot shoe" that Ikoblitz does -- an accessory shoe on the camera with contacts wired to the sync system in the camera shutter. Even current manufacture add-on flashes made for DSLRs should work with a hot shoe on (as an extreme example) late 1940s vintage leaf shutters with PC sync socket (though you'd need a shoe adapter that connects to that socket in that case).
The reason electronic flash won't work with bulb sockets is voltage -- electronic flash uses between 300 and 450 volts, while bulbs need between 1.5 and about 21 volts. There isn't enough power in a bulb flash to fire a xenon flash tube, but most electronic flashes use a simple external contact switch to fire (some with protection against high voltage on the contacts, older ones often without).