Well in BBO context, both Wilkosz and Multi are banned, because of GCC. Guess you can play PC in GCC ACBL, but you have to find a GCC approved meaning for 2♦, and probably lose something in the way. I have seen too many 1♣ explained as "12+". Positively HATE it (so you open ALL 12+ 1♣? No), but haven't see that one lately. OTOH, I ask less these days. (How often this happens now?) Also, the SECOND bid after a multi meaning MUST be alerted, happens rarely. I once (long ago) adjusted to 4♥= when opps missed it after 1♣ : 1♦ : (not alerted) 1♥ (which is 12-14, and 3+♥, or maybe 2+♥ in some variants). I play PC when I can.