It's not likely to last unless you can sew it...but, scuff an area on the glove a bit bigger than the intended patch with sand paper. Assuming you're going to use the rough side of the patch you shouldn't need to scuff it. Put a light coat (no puddles) of contact cement on the mating surfaces, let it air dry. Then apply another light coat to the glove side...let it get almost dry, just a little tack, then position the patch and press together. Lay the thumb patch side up, as flat as you can and using the plastic handle of a small tool press in the center the pull to the out side of the patch...repeat in a sun ray fashion until you've gone around the whole patch, paying particular attention to the edges. I'm afraid no matter how good a job you do the repair won't last long. Obviously it's a high wear spot. Make the patch quite a bit larger than the hole...you'll need at least 1/4 of patch around the hole so the glue will hold, but you also want the edges of the patch to be away from the main stress area.
Long winded...but the advice is worth what you paid. I could patch it almost as quick as tell you how.