I cant find an industrial supply shop in your area. I’d suggest to start with a 2mm taper tap and 1.7mm drill bit. If your not careful both can snap off without warning.
2.5mm is another size that would be handy.
These small taps in a quality brand can be quite expensive.
I use this shop for most of my tool requirements. They will have all the taps drills and most of the screws you want. Saying that id do buy lots of screws of ebay as they are a lot cheaper.
I’m quite happy to help you out any way I can.