Wouldn't go poking around in there too much, without advanced knowledge of how the system is set up.

One spark and you could have a very nasty fire, or even an explosion.

I agree with Craig, go to a different station. BMWs are not unique in this regard. Lots of Cummings Diesels that are installed in domestic pickups have similar setups.

I don't know of any states where you can't readily find the "green handle."

But, if I'm wrong in that regard, I'd be extraordinarily cautious.

Even if the tank were totally empty, most service manuals require the tank to be filled with an inert gas, or allowed to vent for 24 to 48 hours for work on them can begin.

Point being: don't go sticking a screwdriver in there trying to remove the tabs.

I agree wit you the plastic adapter is ridiculous, and I've gone out of my way to avoid using it, although, I've never had trouble finding the green handle, across many different regions, in the West.