I bought CDM Delta Wave safety. Super nice quality wider metal safety. Really happy with it, a good upgrade!
http://jerkingthetrigger.com/2016/04/18/cdm-gear-delta-wave-mossberg-safety/
I thought about a side saddle also and thought the same thing about the width. A velcroed card style might be an idea something like...(https://www.originalsoegear.com/products/velcro-backed-12ga-shotgun-card). I ended up getting a NcStar sling that holds 15 rounds, and figure I will see how...
Like many other things in life, one needs to actually try it before you actually know it isn't something you want. It may be the best or worst but the only way you will know is trying it out for yourself.