You can drive in WA on a foreign license as long as you're not a WA resident. If you do move to WA - you've got 30 days to get a local driving license. There's no law that requires that foreign license to be issued by a US state necessarily, and WA recognizes German licenses and allows to directly exchange them into local licenses on establishing residency (as opposed to any other EU country).
You may run into some additional requirements when renting cars with a foreign license - I've been asked to also present a passport with I-94 in some cases. But other than that it shouldn't be any problem.
Not necessarily related to your question, but keep in mind that if your driving privileges were taken away by a court order, then all your licenses are invalid, even if you didn't let the court know you have a foreign one.