[MRCA] M/S Net on Yaesu FT-920

[KA1LHZ]

I have been racking my brain trying to get my FT-920 on 60 meters. (I
know this would be sacrilege on the M/S net) I could use my GRC-106 in
the comm shelter but it would take 3 hours to get it warmed up as it's
in the shelter parked next to the driveway. The '920 is in the nice warm
house(-15 tonight here). Does anyone have the  MARS / CAP mod
instructions for a US Yaesu FT-920? I've found the 'green wire mod'
instructions and they won't work with this radio as there isn't a green
wire and the number given doesn't work either. I've heard the EPROM
flash procedure will turn the radio into a doorstop. I e-mailed Yaesu
and the tech there insists I have a MARS CAP license in order to get the
instructions even though he's allegedly a ham and doesn't seem to
comprehend that I just want to use it on 60m. Anyone out there that
could help me will be appreciated.
TNX & 73
DE KA1LHZ
Steve