I had a UHK for a few months before refunding it because the shielding wasn't good enough to stop it becoming unreliable when my mobile phone was within about 30cm of my keyboard. I contacted support and the solution was to move the phone away from the keyboard, which is kind of irritating for such an expensive piece of kit.

But, just wanted to share that I was similarly surprised to land on mouse keys as a preference. I tried most of the UHK modules which were also pretty good and have since tried various other trackballs and pads, but since trying UHK mouse keys, they're what I keep coming back to most, even since switching to new keyboards.

One issue I have with mouse keys is fear of using them in front of others though: every so often, if I need to click something particularly small and don't have a keyboard shortcut memorised (vscode panel resizing is one) it can sometimes take me a fair few embarrassing seconds drawing small squares around my target before I resort to actual mouse hardware.

For the amount of time and thought and effort people have put into alternative mice, I feel mouse keys are massively overlooked and probably have a lot of room for software/firmware innovation without hardware costs.