You will need the device itself not an extension GPIO board, an arduino also is just a mcu with atmega32 chip (no cpu/gpu), you can get a raspberry pi 4b up to 8GB ram.
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So I should get something like the Raspberry Pi 400 Desktop?
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Well, yeah, a pi400 is a great choice, but there is no 8GB ram version available and all the devices are shipped with SoC ram boards so you cannot upgrade once bought.
Pi-400 = Raspberry pi 4 (BCM2711) + Portable keyboard, so nothing very fancy about that, in fact it makes it harder for you to install a custom cooling fan or build a case for your pi or use it in a kiosk machine.
My opinion, it depends upon the use, if it would be for an office work then a pi-400 kit would be the best, but i think for game development and testing, pi-4b would be better since you can overclock cpu and gpu and install a cooling system easily (or even using intellij idea or an IDE with heavy work or gradle for long times may require a good cooling system.
Have a nice day, let me know if you still have any questions, we may open a thread "Which Pi is better for jme and how to overclock ? " or something later on 
EDIT :
Just in case you are searching for a high performance graphics arm device that mimics android and able to run desktop, then have a look at ASUS Tinker boards, they have Mali Arm GPUs which show a better GFLOPS performance than broadcom videocore of the pi :
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Thanks for those links.
I’m not planning to embed an RPi in a consumer product. Mostly I want to be able to test JME on it. If it turns out to be useful for other things (travel computer, smart thermostat, …) that’s a bonus.
I ordered a Pi 400 Desktop kit from Adafruit. There are multiple indications that it might not ship promptly, but meanwhile I have plenty of other projects to keep me busy.
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