Sometimes I use a different bit. Usually use a very very mild port bit. It totally depends on my kind of ride, and where I ride. For really technical I use a bit. For group rides, I ride gaited now, I use a bit. For the less technical, swap to an S hack. Same principle as the bit I have now, but you can definitely isolate the shoulder like a snaffle with the S hack, but the whoa is much less decreased. Either of these bits, I can use in an arena doing dressage or out on the trail. If your horse is not used to a new bit and you go out on trail with it, you may have a big issue.
My mare is very well trained to trail. So she can use either bit and do very well. For a lesser trained trail horse I would use the same bit (as in the arena) until the horse is 110% proven and dependable with it. With the S hack I can move her anywhere on the trail, and go over any terrain, or trail obstacle totally safely. It just won’t have a huge whoa power if I need it. But still it is a really good bit. I would not however, go to a snaffle and go on the trail. Nope. Totally different principle from what my mare has been trained.
Sometimes on the trail I will clip the other bit on the saddle. That way I can change it if I want to, or change back, easy.
I would never just go in a halter and lead rope. You just never know. My mare is very forward, and bold. The harder the trail is technically the better she is. She doesn’t have a spook, but horses can be horses. You could ride part of the trail with one bit then swap, and then swap back if you do not like how your horse is going along.
I want my horse totally solid in a bit for the trail, then the horse has to prove to me that she can go to a lesser different bit on the trail. I will ride the horse on a known trail with the new bit, and see how it goes first before just heading out with the new bit. If the fruit bat comes out, then nope, your horse isn’t ready for a different bit on the trails.