Hi 2Barrels,
I don't know if your J P Sauer has intercepting sears, and the only sure way to tell is to remove the stock and take a look at the action internals.
To add intercepting sears to an action which was not originally designed to incorporate them, would be expensive.

Intercepting sears do add a margin of safety if you take a fall and the gun receives a heavy enough knock to release the trigger sear/s.

The gunbuilder who is doing the job of converting your shotgun to double rifle, should be able to tell you if the action has intercepting sears or not.

I think that Heym charges 2 to 3 grand extra for intercepting sears on their SxS double rifles.