If 2♥ is forcing, then 3♥ must be splinter. Any unnecessary jump shift should be understood as splinter. After North's 4♥ bid, South should not bid 4♠. Instead, (s)he should jumped to 6♣ (5♣ is also acceptable imo). 4♣ over 2♣ is also a good choice (bid over 3NT should be viewed as slam interest) for new partnership.