I see it as a good way to futureproof by buying 31.8 stem if you can - that way you have a choice for both as many bars are now 31.8 but not all.
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Hi, they certainly exist, I bought one yesterday in W-ton £6.99 but he let me have it for £6. It is silver and two piece, Haven't tried it yet but will do in near future. This has been a bit of a problem for me and I resolved to make a few in future, I have three O/size stems and the same number of 1" bars. Hope this is in some way helpful.
Cheers Kit.