Yesterday I met a lovely helpful girl at the mobile counter at Hardy's (3rd floor) in Sanur who was willing to experiment making a microsim. She cut up an old active sim card of hers down to microsim size from a template I'd photocopied off the net. It worked! So she cut a brand new one up for me & I have been phoning & texting successfully since. I left the template with her for future customers.
I should have asked her name, but I am ashamed to say the delight of getting service on my iPhone got the better of my good manners. She was pregnant, so shouldn't be hard to spot.
Cheers