I don't think you could bore them if you had access to the equipment.
The "o"ring grooves on the bottom of the 4inch sleeves are for 1/8". The grooves on the 4 1/8 sleeves are for 3/32". By the time you open a 4" to 4 1/8", you will nearly cut the sleeve in two at the "o" ring grooves. Or at least greatly weaken them.