Factory BBP on 7.25 axle

Here's what I would do. I would find a member within a weekend trip distance who has a lbp 7.25 laying under foot. If it still has springs attached you're golden. If not you will need to buy 4 U bolts before you hit the road. Swap the sbp 7.25 for the lbp 7.25 right there on sight. All done, the donor still has his scrap metal weight value and possible resale value in the sbp drums you leave behind.
the donor needs to be willing to work with you though. A trip to a tire store and probably a part store will be req'd. If you already have adapters on the rear allowing you to run lbp wheels on you sbp rear, you won't need the tire store or even the lug nuts.