you can get cheapish refurbished window tablets with touchscreens that work quite well which is something i did.I bought it just for mfme to have the touchscreen landscape experience.
Even if you could get in on a phone it would be quite small.
At one time i had a shadow pc so could load that up on any android phone via the app but it became expensive and uneconomical to run so i dropped it.Ok for lo-tech
i also had it running on windows on the steam deck lcd version as well as the great arcade simulator but doesn't yet work on the oled version as there are no sound drivers available and that trips up mfme.Hopefully they will come soon was looking forward to playing them on the oled.
So there are options for a portable mfme.