You can just flip the existing valve stems around and then redrill a new hole on the other side of the rims and install some regular automotive valve stems in there.Plus you will be able to still put air in your tire.Any tire place or local shop/parts store will carry them and just try to get them the shortest you can 1 inch or so. It will be more stable for sure with both being wide.It should not affect the steering any being narrower in the front.Flipping the rims will add an inch or so the back will be 3/4 inch wider on both sides.Try it where it is now with the shee axle then flip the rims and try it and see what you like best.Good luck