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Not quite sure exactly what you're asking but I've had a lot of success running 1x chain rings (usually the Hope ones) on the inside position of road double cranksets (Ultegra, sram red etc). However, that only works with 42t or smaller chainrings, as otherwise you're in danger of hitting the chainstays. It depends on your frame but going larger, you'd have to run them in the big ring position which would give you a worse chainline. I think it would still work but wouldn't be as ideal as you'd constantly be cross chaining.
I assume the 1x direct mount spider / chainring would fix that issue.
OK, this is just to make sure I've understood it correctly and am not about to commit a huge mistake: SRAM 1x and 22 GXP cranks are all the same thing in terms of dimensions once you take the directmount for the chainring(s) off, correct?
I.e. you can take a SRAM Force 22 crank, for example, and put a directmount 1x chainring on (wolf tooth or absolute black or whatever), and it will be the same thing as putting that chainring onto a Rival 1 crank.
Obviously, one needs to get the correct type of directmount chainring - but it will fit the same on both 1 and 22 cranks?