pescetom, on 2025-July-03, 15:24, said:
The probability that Opener has a 4-card spade to go with the 5-card heart is 10%, the probability of Opener holding 5-6 or 5-7 in majors is 0.3%. (Source: Pavlicek Calculators http://rpbridge.net/cgi-bin/xch1.pl). I think North's best course of action is to make the max info bid & let Opener decide.
I wrote that 3♦ is best, I still believe it. If one is so worried about missing a spade game or partscore, a weak 2♠ --- as per OP's system --- is a (distant) second choice.
I hate passing this hand. However, the idea of responding with an unlimited & forcing 1♠ feels bad at a gut-level.