Hey katit, listen to those, which includes me, who recommend drilling larger valve holes in your rims and continue using shrader valves (The 21/64 or close bit will work fine and chamfer the edges - take your time and gradually work your up to the correct size bit) I've been doing this in my shop for 30 + years with zero problems, so don't worry.

This is the best and most simple solution so disregard all the other idle chatter.