4 options I can think of, all require access to a lathe or know someone who does.
Can you lose 1/8" off the diameter? If so re-thread them to 7/8" unf.
Get a lee turret press and have one or more holes opened out to 1" unf.
Get a Lee press with the 1 1/4" die head and have the 7/8" adapter bored out.
As above but get some sleeves made 1" unf inside 1 1/4" outside.