Yes, I had a DBS check before and it wasn't an issue. But I wonder how onerous safeguarding policies are. Also I would be wary of being in a room with a pupil without another adult present. Even the slightest accusation, where you are completely innocent, could make your life hell.
Sporting organizations require more than just a DBS check, they typically also need you to have attended a course on good practice in protecting children which you will need to refresh regularly. There will be standard policies that a computer club could copy from other youth organizations.
> I would be wary of being in a room with a pupil without another adult present
I think a far greater danger is your club becoming a dumping ground for parents wanting free childcare.
But yeah, running a club solo is not likely to be sustainable if you’re not (somehow) connected to the location that you are running it. At least with two people there’s a fallback. A lot of clubs don’t have this, though, so don’t let “perfect be the enemy of good”.