Strictly speaking, as far as hour building goes, there is no P2 seat in an AW109 because it's a single pilot machine. There's nothing to stop you sitting there (as a passenger) but you cannot claim any hours towards a licence.
As for getting "let loose" as captain in one after "graduating" in the R22....you wouldn't get any operator to agree. It's a little like expecting drive a Ferarri for a living shortly after passing your driving test in a Nissan Micra.