Opnening 2♣ as forcing i guess is quite hard, when u RHO had already opened 1♥. Difficult; u can probaply rule the Grand slam out, its hard to imagine a hand where prd has 2 aces and a king and has passed. 4Nt would be both minors in our system, it used to be specific aces asking, but we change it. 4 must be forcing, but what is prd going to bid it, if LHO passes his/hers bid is forced and if LHO bid 5♥ he would probaply pass or bid 5♠. If we bid 3♥we let LHO in even cheaper, and prd will not have any good bid left. Good problem.