I often play the Smith-Morra gambit. Recently I've been seeing black play an early Qa5, such as
[fen ""] 1. e4 c5 2. d4 cxd4 3. c3 Qa5 4. *
[fen ""] 1. e4 c5 2. d4 cxd4 3. Nf3 Qa5+ 4. *
It seems to throw a spanner in the works as to how I'm used to playing this opening. If met with 4. Bd2 then black can play 4... Qb6 hitting the unprotected b-pawn. It seems like black can bring the queen out early without the possibility of white chasing it around the board.
Question: How to best respond to an early black Qa5 in the Smith-Morra gambit?
Chess Opening Secrets Revealed suggests playing a later Bf4 depriving the queen on the c7 square, then play a3 followed by b4. But this seems like an awful lot of non-productive moves to chase the queen around, especially when you can't fianchetto the dark squared bishop.
Crafty suggests 1.e4 c5 2.d4 cxd4 3.Nf3 Qa5+ 4.c3 Nc6 5.b4 Qc7 but this seems to just weaken the pawn structure, and make the white's thematic Bc4 more difficult to play.