You are going to have lots of dirt (silt and muck) available if you are going to clean out the pond. Where are you going to spoil that fill? Might as well use it productively if you don't have good spots for it.

I like your idea of extending the creek a little farther. One option would be to then build two small creek diversion dams. You could put a small culvert (8"?) at a lower elevation in the dam where the creek diversion sends water to fill the pond. That dam should have lots of freeboard, so it is never over-topped in a flood. You could then put a large culvert (36"?) set with the bottom elevation just above the top of the small culvert. The idea would be that small rain events go through the small culvert and feed your pond with cleaner water. Large rain events would also feed your pond, but most of the flow would go around your pond through the "emergency spillway" (the large culvert) at your creek diversion dams.

How big is the existing outlet pipe for your pond?

You will have to adjust the sizing of any diversion project based on your actual experience with heavy rains running off of your watershed. For example, if the emergency spillway of your pond is utilized twice a year, for water flows that overwhelm your 24"(?) outlet pipe, then you will have to modify your stream diversion dam outlets accordingly. You might have to forgo the large 36" culvert and just build a designed hardscaped diversion spillway for big rain events if your flows are that high. (Or the large culvert is ugly, etc.)

Good luck, you definitely have lots of options to optimize the features of your pond. Judging by the satellite view, it should be a beautiful property with a vibrant pond if you can get everything balanced correctly!