Any question answered...

Dunno, probably when cross chaining - try it. If they do just space them out a bit. Wheels Manufacturing make some chainring spacers. I've got a box of them at work.

Thanks, I should have also mentioned my concern about running a 5-6 speed chain across those skinny 10 speed teeth - too sloppy?
(This is obviously not a high speed set-up; down tube friction shifting)