I'd love to have a language that combines the notation of APL with the ergonomics of J (ie. hooks and forks enabling functional-ish programming, a de facto open source implementation and a working Android "IDE").
I personally find the APL notation substantially easier to start with over J because each symbol is more mnemonic for what it does and because each operator uses a single symbol which helps a lot with mentally tokenizing.
I don't know what is needed to get from Arm Linux to Android.
Many modern APLs—Dyalog APL, NARS2000, ngn/apl, and dzaima/APL—include support for forks. They're usually called function trains in APL.
I work for Dyalog which is a "competitor" (in practice, the APL market share is small enough that any APL doing well helps us all). We have a lot of respect for other APL implementations and frequently use their choices as reference points for our own decisions. GNU is the only exception.
Also great work on Dyalog, which I had a personal license to back when I experimented a couple of years ago. I can't recall what my problem with GNU APL was but I quickly found it too painful to try and learn with.