I'm using an Alfine crankset with Deore 11-34 in a 1x9 setup on a Surly Cross-Check and it works fine. So it should be good to go with 1x10, too.
I remember when putting together my parts list a similar feeling of confusion - I couldn't find a definitive statement that it is OK for an Alfine crank to be used with a cassette rather than a hub gear. Turns out it is no problem. Also, because the Alfine front sprocket is purpose-built to be run as the only front sprocket it has no pegs/ramps/etc to encourage gear shifting (unlike say a front triple that you've stripped down to a single) and so you don't need to run it with a chain keeper to stop the chain falling off.
I'm using an Alfine crankset with Deore 11-34 in a 1x9 setup on a Surly Cross-Check and it works fine. So it should be good to go with 1x10, too.
I remember when putting together my parts list a similar feeling of confusion - I couldn't find a definitive statement that it is OK for an Alfine crank to be used with a cassette rather than a hub gear. Turns out it is no problem. Also, because the Alfine front sprocket is purpose-built to be run as the only front sprocket it has no pegs/ramps/etc to encourage gear shifting (unlike say a front triple that you've stripped down to a single) and so you don't need to run it with a chain keeper to stop the chain falling off.
Hope that helps!