It used to be you could buy a Warn hub kit for the front D30 and convert to 5 on 5.5, but that is no longer an option. Spacers do it, but...they're spacers. You'll be wider, and forever have to watch the torque on the spacers.
In the rear, it's easy. Buy a set of aftermarket axle shafts and use the 5 on 5.5 holes when threading in the wheel studs. Then just re-drill your stock drum or disk rotor for the 5 on 5.5 pattern and you're good. Up front you could find a Ford HP axle, cut it down to about Waggy size, use waggy axle shafts, and have 5 on 5.5. It's a lot of work....
Or....I once saw a guy convert a YJ to passenger drop by putting in a Dana 300, then he put a wide-track CJ D30 up front, XJ 44 in the rear with aftermarket shafts and the previously mentioned re-drilling method. That gave him 5 on 5.5 That was a LOT of work...
The way I did it on my TJ was to scrap all the Jeep stuff and put Ford axles under it. Full-width HP 44 with a custom Ford RA setup up front and full-width 9" and a home built link suspension in back... That was an unbelievable amount of work....