What is the pump for?
Is it a pump for the trans I take it?
This type set up could have many possibilities. One way would be a stand alone set up circulating the oil through the cooler filtering it at the same time. This way your oil could be cooled at any time even with the motor switched off and have no effect on the normal flow.Looks good Jeff ! Did you decide the filter thing will work without interfering with the flow ? I remember you mentioning the trans mount filter you had for a little while could possibly get clogged causing issues.
The pump could be thermally controlled and with the option of a bypass switch so you have the ability to run the pump manually.Will the pump and filter both be thermally controlled?