I don't know much about the plastic pub kegs, but I'd try them out if had access to some. I know someone managed to get the spear out, but I don't think it's the same mechanism as a standard sankey.
Carbing a sankey just requires making sure the liquid out is blocked somehow. You can connect it to line with a faucet, or you can replace the beer out tailpiece on the coupler with a dime.
Yuri rubs it out with 60 grit... wouldn't even feel a tenga egg. -Randar
, place entry ox dixla to suck. Fcxk fwnpoo and passed. Hel an my spupid ass. OK. - TXCrash