Invention of new bids

Sometimes it's not easy to find a decent bid. Like the canapé article mentioned, it's not always easy to show a difference between 5M-4m and 4M-5m. And then you still have those nasty 4441's! Here's a possible hand:

♠ J
♥ AK84
♦ QT62
♣ Q754

The bidding starts:
1♦! - pass - 1♥! - pass
1NT! - pass - 2♣! - 2♠
?
1♦ showed 9-14HCP and 4+♥ (MAFIA style)
1♥ showed invite or better, relay
1NT showed any hand with 4♥, or a maximum balanced
2♣ is another relay

NOW your RHO intervenes (why didn't he do this before??) with 2♠. At this point, your partner already knows you either have a balanced hand, a 4♥-5m or a 3-suiter.
3m would definetly show 4♥-5+m, 2NT balanced with stop. So I thought, lets show our maximum hand without stop: 3♠. This however is no systemic bid, since we don't expect opponents to pass first and intervene later...

Afterwards I was glad to hear partner say that I could indeed only have this type of hand.

What if he immediatly bid 1♠? No problem, now I can show a maximum hand (with similar distributions) by bidding 1NT (so no minimum anymore). And if he intervenes with 2♠? Then I can only try 3♠ again, denying a 5+m or balanced hand with stop...