Well you get your thumbhole sized at the larger size, then just use tape as you shrink. (basically what I do, my thumb is larger early and shrinks at night)
One trick you can do is take a thumb insert thats a little smaller than your thumb size and shove it on your thumb between making shots. Then take it off just before you make a shot, it compresses your thumb some so it will fit
(option if no thumb insert you can use a thin handkerchief, napkin or something similar, place it over your thumb and shove it and your thumb into the hole.).
Another place your thumb in a cup of ice, just make sure to dry it off good.
Another I seen done was keep holding your hand up, it looks silly but your hand drains down some.
Of course watch what you eat/drink before bowling, like lots of salt, liquids etc. that might make you swell some.
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