Sadly this is not possible due to the flatpatk sandbox, at least without having to rewrite basically the entire application. You can’t open other applications or shells from the sandbox, so nothing would work.
Someone told me that it is possible in theory to reduce the level isolation of the sandbox via flatseal, but that would require the user to perform additional operations to make it even work. If it is not going to work out of the box, a flatpak version would not make a lot of sense.