This won't prevent the swelling but a little trick you can do to get the thumb down is to take the edge of your shirt, a thin towel , or silk handkerchief and force your thumb into the hole with that fabric.. it might be a bit painful but it will shrink your thumb for a good 5 or 6 frames.. and you can do it over and over and it seems to work..
I have used this many times and has got me out of trouble in leagues and tourneys..
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16-17 mph,350 rpm,PAP 5 1/2 x 3/8up, HighGame 300 x 3, High Series 782
Book Average 215 / 205,PBA Xperience ave180