what about running odd lace paterns 4x rear 3x front?
Well there’s no problem with that, I’ve used 0x to 3x in various combinations, though I’d never use daft ones like crow’s foot or snowflake.
Rather than thinking “what patterns are best?”, ask yourself “is anything about 3x going to make it unsuitable for my uses?” Reason being that the former will just cause lots of beardy people to start arguing on the Internet, and the latter will result in “probably not, let’s do that then.”
What’s the flange height on the dynamo hub? If it’s huge you may want 2x, otherwise 3x all the way. Use good spokes (DT Comps are my preference if you’re not spending boutique money) and brass nipples.