yeah any workshop that can do a std vl commodore can do the rb25 no worries
you could even buy your own consult calbe and take it and show them it plugged in if they are anal about "no computer access"
but at the end of the day
its a std piston engine, change the oil, check the basics, clean this, top up that blah blah
its not like an rb25 has super cool special liquid unobtanium or alien spacecraft rods