A short, ridgid, straight extension should work very well for you. I've used them for years now. I perfer the ones that have the Schrader valve exposed similar to your original valve stems. Here is a sample
of some available.
Here is the type I perfer. This one shown is almost 3" long-
I would suggest you get this very special air chuck
Try the chuck before you do anything else. You just might reach the valve stem as it sits there now.
The reason this chuck is so special is because once it is placed onto the valve stem, it only needs to be tilted about 5 to 10 degrees to lock on. I set my compressor output pressure to 5 psi above the axle pressure I desire (tires cold) and tilt the chuck back to straight on to release it, and it "pops" off. You can then let a little air out if need be. This chuck takes all the kneeling, squating pain away while holding a chuck on to a valve stem.
I've only seen this chuck available in one auto supply store- and I have looked at many, and here it sits to be delivered directly to you and you'll have it the rest of your life. I've bought these and given them to family and friends that do their own tire adjustments- Great gifts.