Someone already mentioned Grizzl-E, there's the DeWalt 32A portable (with 14-30 cord), and more. You could get the GM dual voltage portable, and order a 14-30 connector. There's even a number of old Clipper Creek units on eBay, for about what you'd spend on a new charger.

You can find simple adapters to 14-30 from the common NEMA 14-50. Many level 2 EVSE models can configure a current limit. The details may be buried in the user manual, though. It could be in the built-in UI, an app on your phone, or old school DIP switches. Grizzl-E has DIP, Emporia (at least the load management version) has an app.

Alternatively, you could replace the 14-50 plug with a 14-30, or hardwire it. It should just require a wire stripper and wire nuts.

Finally, and this is one that may require professional guidance, check the specs behind the 14-30R. It may have been chosen because that matched the dryer, and could be easily upgraded to 14-50R. But don't attempt this unless you know what you're doing, and you have enough data to know if it's the right move, and all of the pieces are up to spec. This includes knowing the wire gauge, length, and entire path.