1.) what about a special subpatch? like pd-try, or just try, it could work as a normal subpatch, but with a mandatory outlet that would catch errors for the objects that live inside it
just like we can open a [pd] object or a [clone] object, [pd-try something] would be the same but with an added outlet for errors
2.) another idea would be that try just loads the object in its first argument (and passes the next arguments for that object creation) with an added outlet if this object throws an error
so you could use [try soundifiler], and this would be a normal soundfiler that gets one more outlet
i like the catch idea, just thinking about other options too