Change to Large Bolt Pattern

My '67 Barracuda convertible is in the paint shop. I would like to change it to large bolt pattern for billet style rims.
I have a 7 1/4 rear end presently.
What is the easiest (least expensive) way to convert to LBP on both front and rear with the 7 1/4 rear end??
I plan to install an 8 3/4 rear, but even that would have a small bolt pattern on it and require a change.

I certainly appreciate any advice.

GLJPLC
Louisiana