For what it's worth, I've had good success with Mechanique in politely asking for "special" loader hex files. Mine were for the 18F1220 and 18F1320 using the internal oscillator at 4 and 8 MHz (so a total of 4 files). That was a few years ago.

So have you emailed Mechanique and asked? I really don't think it's a huge deal on their part.

Best Regards,
Paul