I'll post more detailed instructions shortly but today I got a Junebug working with a 3.3V 24FJ16AC002
What's required is simply two 1N5817 diodes acting as clamps connected between 3.3V (anodes) and PGC, PGC (cathode)
There is a trick though, you must program the Junebugs 18F2550 EEPROM with a calibrated VDD value. I'll upload a small .hex file with this code this evening. I'm also working on a hardware mod (removing either the 1N5817 or BS250 to allow the PICkit2 software to self calibrate (jumper from VR2 @ 4.2V to act as a VDD source)
I've not tested the Inchworm yet but will later an post the results.