Anyone seen a fill adapter to use Buddy Bottles (like BSA) to refill PCP's?

I have several BSA 200cc bottles around, plus a 280cc & 400cc bottle.
Has anyone seen a fill setup that would allow us to use a Buddy Bottle to refill a PCP?
The little 200cc bottle is so small, yet fills to at least 232 BAR, it would be great for topping off smaller tubed or lower pressure airguns like a Prod, Falcon FN6 / FN8 / FN12, Brocock, Disco, or HPA rigs out in the field.