Before going to all that trouble see if you can possibly bleed the brakes with the normal bleeder. It’s tight but probably not impossible.

Or move the backing plate flanges and use the drums with less offset as explained above. This also looks better because the drum is not so far outside the wheel.

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-