While I was waiting for my new MIDI interface to arrive through the mail (still waiting btw) I was searching for some midiboxing to do. I had some spare PICs that still needed programming, and had an old, never used ('cause it never worked 
JDM module lying around. Redid some solder joints, soldered an extra resistor for the 18F series, tried it and halleluja! Just burned the BullShitLoaderBootStrapLoader into 10 PIC18F452 with it ;D
Guess JDM is not entirely dead after all. I just need to find a way to burn my PIC18F4685 with it. Any hints?