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Simple good old fashioned Titbond is sufficient to hold the bridge back on.
Test fit the bridge.
Remove any bulk glue before you clamp, once the clamps are in the way it makes it slightly more difficult.
This clamp works by clamping through the existing pin holes, you can also use sound hole clamps directly onto the bridge.
Nice and tight
Again do a glue clean up.
After 24 hrs you can remove the clamp(s)..
One of the side effects with clamping and glue, is you get glue in the pin holes, so this needs to be removed.
You can see the glue stops the pin from being fitted.
Using a tapered reamer, we open the hole up.
Old glue removed.
You also need to clean the old glue of the base of the bridge, after this run a razor blade around the edge to recreate the micro route.
Plenty of glue.
I use 220 grit to clean smooth the wood.
Do the same for all 6.
String it back up and play.
Another clamping method for fitting the bridge back on is with a Vacuum clamp - Attached link