is it possible to create a custom firmware that will boot into service mode by default?

i have a ps3 with broken blu ray drive, but can't find any jig/homemade dongle that will allow me to access service mode to remarry the drive to the mobo.

is it possible to make a cfw that will be version 3.55, can be flashed without a working blu ray drive and will boot to serice mode by default?

(once married, i can then reflash kmeaw or somthing to allow me to run pkg's etc)