There are several brands available. Just google "Shotgun Trigger Guard" and you will find choices from $$$ to $.

If you head the golf glove direction know that they make several types. Regular gloves are the lightest weight and come in leather and synthetic and combination leather/synthetic. They also offer rain gloves - slightly thicker - with a tacky surface on the palm. Winter gloves are the thickest. Most come in small, medium, large, extra large and a cadet version in each size for those with shorter fingers. With all the choices you should be able to find what you need. Most golf shops will let you try them on.
I always wear gloves shooting or hunting. I try to keep as many things as consistent as possible so even in hot weather I have them on.
I had not seen thegunglove.com before so will definately check it out. Thanks for that post! I don't like gloves that are too loose, too short or too tight.
Good luck and report back on what works from the suggestions posted. I really think you are headed in the direction of a new Parker.

I put one of these on each and every doublegun as soon as I own it. It only took me banging my finger a couple times to learn that I never wanted it to happen again! Might be ugly but they work.

https://i.imgur.com/rfRgUCpl.jpg

Problem is if there's not much room between the triggers for your fingers, gloves won't help. It'll be harder to place your finger properly between the triggers with the extra material. Let me ask, are you placing the first pad of your trigger finger on the trigger or the first knuckle joint? If it's the joint, that's the problem. The pad should be on the trigger, not the joint. As for the beating your middle finger takes from the trigger guard, a glove should help with that. I do use the Gun Glove, but the thin Mechanix work gloves really work well. Hope this helps.

Thanks, found them. Will order 2 of each to see what works, spring steel or retainer screw.
Just as an aside, it seems the 12 ga repro I have is the tightest of the bunch and causes the most damage.

I realized that I need longer LOP to keep my hand back and just the pad of my finger on the trigger. It takes conscious effort with a pistol grip to keep long finger from sliding through and having the knuckle on the trigger. It's easier with straight stock to keep my hand back.
A lot of subtle adjustments to learn.

Thanks,
I know tonight I'll be searching for single trigger with straight stock and 15 1/4 LOP :)

I first ordered the spring models and thought they’d be easy on/easy off but found they were hard to fit and didn’t stay in place. I returned them and got the ones with the screw.

Say it ain't so! Double triggers are the tradition. You need to find a nice Parker with an articulated trigger. Generally those are limited to AH grades and higher, but I have a nice CHE 20 that has one special ordered. If you don't see the theme here -- get more guns(!) -- make sure your Dr. wife knows this is about your overall health and wellness.

Thanks Phil
I am ordering just the type with the screw. Do you move it from gun to gun or just leave in place and have enough on hand to cover the collection?