Do you have the drivetrain parts already?

If you're makeshifting with parts you have, then I think going to the other side of the spider and such is a great idea. But if you are buying all new parts, which is how I understand it, why not just buy parts that work? Confirm your rear hub, figure out what cranks you want, and then match them up with the appropriate bb. All new cranks will give you what bb is required for a standard 42mm chainline(assuming standard hub) and then you can just go that route.

This just seems simple to me if you are buying all new parts to match the hub...am I missing something?