Since you asked this question, iFixit added a special standoff bit to their tools catalogue.
iPhone Standoff Screwdriver Bit (Item code: IF145-343-1)
I use a 'STANLEY 63-310 U.S.A.' pocket slotted screwdriver for this task. It is good, though not perfect: its blade is just slightly wider than screw head, so it will collide into nearby components. I need to slide it slightly after every half turn, so it overhangs clear/free area, instead of overhanging populated area and bumping into parts.
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Here you can find different market reports about tools-
https://www.factomarketinsights.com/
crwdns2934271:0crwdnd2934271:0 Mark Johnson crwdne2934271:0