I decided to test the scaled using a Raspberry Pi instead of a PC to try and make it more portable. The result was that it worked with a Raspberry Pi Zero W okay. It was a little sluggish but that was okay. The problem was without sound on the card I was better using a normal Pi. I also tested a Raspberry Pi 2 with a bluetooth dongle that was not much slower. All the tests were done with Raspbian.
In the end I decided I was not using it enough to solve this problem that in many ways was not a problem. It is a problem that can be solved though.