I'm in the Vancouver area.
By "fill adapters" are you referring to the screw-in inserts that convert a 230 bar (5-thread) DIN valve to yoke for filling and use with yoke regs, or something else that attaches to the filling whip?
I have inserts for the 230 bar valves on my worthington tanks, but my PST tank has a 300 bar (7-thread) DIN valve, which can't be converted with a screw-in insert. It was this type of tank in particular to which the shop employee was referring, not high pressure tanks in general. My usual shop has no problem filling it.
I am referring to this adapter that screws into your DIN tank: Din Valve to Yoke Scuba Tank Filler Adapter
These adapters work with my two steel Sherwoods and my steel PST (and my hubby has two 100 steel PSTs).
Hope that helps,