Of course the Accutrigger is excellent. I have one on my muzzleloader. However as you have found out they can not be retrofitted to older actions.

I had the same issue with my Savage 210 bolt action shotgun. I replaced the factory trigger with an after market Timney trigger. I paid 55$, and installed it myself. The instructions were very clear and easy.
The only fitting that I had to do was to shorten the overall length of the finger portion of the trigger. As it came it was a touch too long to fit in the trigger gaurd. I was able to shorten it in about 5 min using a drill with a rotary grinding bit.
Total installation, tuning, and safety check took less than an hour.