If the AJ-500RC is truly unobtainable, the next most-affordable slot-head 12th fret might be the Recording King Century Studio guitar… “V” neck, wide nut, light bracing, nitro finish… supposed to have decent tone and construction.
I think they’re Spruce and Mahogany though, and looked to be smaller-bodied – OO or even OOO? Asian manufacture, maybe $700 – 800 street… worth a look.