Just ground it to bare metal near where you are welding. This is only to get a good circuit between the weld and the ground clamp.
Electricity always takes the path of least resistance. From the ground clamp to the area being welded on steel is very low resistance. Nothing outside that path is going to be affected in any significant way. Current isn't going to travel up the loader arms into the chassis into the wiring harness through a ground and into an electronic component and damage it. It ain't gonna happen.
In my 50 years of experience in welding on cars, trucks and heavy equipment, I have never disconnected a battery, alternator or other electronic equipment, and nave never had any problem whatsoever. The only caveat is if you are welding close to a battery, then remove it because of the possibility of igniting hydrogen gas given off by lead/acid batteries, or if welding close, within a foot or so of an unshielded electronic device, you might want to remove it because of the EMP or RFI given off by the arc.