How likely can a 65 year old male stave off surgery on trigger finger? Consider that I use splints, stretching exercise & don't use hand for my job.

Your local, friendly. Hand surgeon can inject rx (i prefer celestone) into the area & achieve, in most cases, at least temporary relief. Ps: you might better say: "...Use my hand in my vocation." (--just jerking your chain). The fact the you know to stipulate that, suggests you know more than your question otherwise indicates...
Probably for years. For years but why go thru misery - surgery will get you more function.
Pipj tapping. Night time tapping of pip joint works fine or splint the pulley release takes 5 min to do through a half CM insicion what are you afraid of it works great.