My company did this a couple of years ago to some machines we host ourselves. It is a bit of trouble to set up but it is not that bad and can easily save a 1000+ dollars per month since GHA runners are very expensive.

It is that grey zone where it is kinda worth it to pay someone to do it, but also might not be worth it the headaches of managing that person and the infra (like what happens if they go on vacation). The improved speed is the thing that tilts the balance.