There are some people working to get Windows 10 working on the Raspberry Pi 4B. I'm eagerly waiting for this to be finalized, then I can build a portable keyboard solution for vArranger, and not the monstrosity I am currently using - a 2 manual + pedal vArranger organ. Them my vArranger setup can be more like the commercial professional arranger keyboards on the market.
There are a lot of compact windows computers already in the market
I use this one...
https://www.spareit.nl/nl/computers/desktops-workstations/hp-elitedesk-800g2-dm-i5-6500t-8gb-120gb-ssd-windows-10-professional?gclid=EAIaIQobChMI8PXIscq06wIVCeh3Ch2Q4g2bEAQYAyABEgL92vD_BwE (https://www.spareit.nl/nl/computers/desktops-workstations/hp-elitedesk-800g2-dm-i5-6500t-8gb-120gb-ssd-windows-10-professional?gclid=EAIaIQobChMI8PXIscq06wIVCeh3Ch2Q4g2bEAQYAyABEgL92vD_BwE)
Thank you Carlo. Yes, there are small computers for vArranger, but I am hoping to use Raspberry Pi 4 model B because it is very cheap really very small.
I run Pi-hole in my Pi 4B. I thought about adding an audio/midi board to it, but I thought it would waste of my time and money. Unless your 24 hours a day are worth less than $10, it's not worth it; your time or your effort. As Dan Carlos mentioned, I would look for a mini PC or a hybrid.