Hey, I'd have to look into this and I'll be honest and say I'm not 100% sure. This is my first full scale GameMaker game so I'm still learning. I was under the impression streamed audio would result in the game's audio files being placed in a separate folder accessable by players and I didn't want them tampering with them. I'd love for you to be able to put the game on a handheld though so I'm willing to try and work something out.
Also, I didn't even know putting GameMaker games on handhelds like that was possible, I love retro handhelds (I built a handheld RetroPie a few years ago and use it to play GBA, SNES, NES, and Genesis games). What handheld do you use?