The opener is weak, you have a weak hand, they will interfere most of the time, the hand belongs to them ! So most of the time you won't have to exercice a choice on 2NT. With 5-5 in the majors not too weak or strong I would bid 3 ...
I play a weak NT too (12-15)
Why can't I use stayman with weak 45xx? On 2♦ you have no problem and on 2NT you choose the best contract 3♣ (The opener can be 6♣2♦(32) or you bid 3 of your 5M, you will ...
I may be off-topic as I realized that the OP has only three responses to what he called "Garbage Stayman" so I apologize in advance.
But If you add one more response to the 2♣ relay (I prefer to call it a relay), e.g 2NT promising 5♣2 ...
I play that 2♦ in response to 2♣ Relay/Stayman always promises 3 cards in ♦
You solve most of your problems ....
My range for 1NT is 12-15 HCP
With 0-5 HCP will always bid
Latest news : Not over yet
Quote
Khun Chakorn, the District Chief, who instigated the raid on the Pattaya & Jomtien Bridge Club in South Pattaya on 1st February, has re-iterated that he intends to process the prosecution against the 32 Bridge players and allow a Judge to decide if anything illegal ...
Why did nobody stick with the old German Lady attitude who refused to sign the « guilty » document in thai and refused to pay bail ? Whatever any thai Lawyer may say …
The Thai police would have been very annoyed if it had happened …