Ive had the safety come off many times with 1911s. I think part of the problem in my case was the Bianchi holsters. They mold the holsters on dummy guns, and the safety is OFF on the dummy guns. That makes a positive pressure point pushing the safety OFF on a gun with the safety ON. I can take the thumb snap area of the holster and push it, and the safety snaps off easily with little effort. The holster could be wet molded to the gun with the safety ON and it should help, but its also partly poor leather that's too soft in some cases.
If you look at your safety, the flat flange with the angled nub that cams/pushes the plunger in, you can carefully file that cam area (undercut it a bit more) until it changes the amount of pressure it takes to disengage the safety. Ive done several, its fairly easy and works well. I saw where some goob tried it with a grinder, with predictable results. Its simple with a file, and you shouldn't ruin the part like the goob did.
As for youre alien Gear holster, could a safety shield be attached to it so your clothes or body cant push against the safety?
I carried a hammerless J frame doing carpentry and construction work. It was reasonably easy to keep it out of trouble, even with crawling around in tight places and odd positions. Not as much horsepower as the 45, but it was always there. I often was wearing a t shirt and being around the homeowner a lot while working. The J and speedloader in the front Carhartt pocket worked fine. The front sight wears through the pocket now and then and has to be stitched up. Painting the front sight orange fills in the serrations and helps keep the wear down some.