For $11 it might be worth it to just buy another tire to solve that seating problem. I had a similar issue seating some 27x1-3/8" Club Roost Cross Terra tires on 27x1-1/4" (non-hook) rims, so I ran them at 50psi for awhile and they straightened out.
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"My only true wisdom is in knowing I have none" -Socrates