How about the Sigma RF-S 18-50? It’s larger than the EF-M 15-45, but it is f/2.8…
The crunch for me remains there is still no FF equiv of a 24-70 for R crop - the EFM 15-45 rocks in practical use! (Only close-ish options are the old EF 15-85 which i large and not as good optically IMHO or the RF 15-30 which I do have).
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