Agreements:
2♠ over 1 of a red suit is weak, so that's out.
RKC 1430 if trump ever gets established and if you want to do it.
How do you envision the bidding going?
Part 2: Suppose instead you are playing strong jump shifts. Is it better? Specifically:
1♦ or 1♥-> 2♠ is strong, and if North follows this with 4♠ it sets spades as trump and shows a good but not great hand. Bidding 3♠ on the second round shows a very good hand. The jump to 2♠ on the first round and 4NT on the second round would be RKC for spades. Would you do any of these things?