I stumbled onto this post a bit ago and occasionally get email updates of people upvoting it. Maybe if it gets enough attention / traction JetBrains will listen and build out an ARM capable version of their IDE's for future iPad OS Support? At the very least I think it's worth a shot. There's already a variety of functional programming apps on the iPad for platforms such as python, CLI, Lua, Js, C/C++, etc.
Maybe if JetBrains spear heads this mobile development initiative, we'll see improved support from apple's side too.