Critique my opening prep plan with 1) a3

I'm planning to play sicilian and slav as black and with white play 1)a3 and hopefully transpose to sicilian and slav with 1extra tempo at a3 which I feel can be unexpected in the unexpected possibilities it can open in familiar positions .

I'm around 1500-1600 blitz in lichess don't have much opening prep other first few moves in standard openings with white black . Having full time job with kid own time is pretty limited . So planning to minimize prep and still have solid repoitre. Mainly play 5+3s.