I am considering SWO. However, my mentor and prior Commander is an IP officer and I was instructed if I wanted to be taken seriously for IP to only list IP and SWO-IP options. Since I am still within my 6 month window of the June 2018 board I am unable to add another designator. If not selected this round I will likely pursue a commission as a SWO.
I think SWO-IP is now just for USNA/NROTC.
OCS boards done care about persistence, it is all about the best qualified candidate, persistence is a word that get tossed around with all types of boards in the USN and it just doesn't matter.
If you are set on the IWC community Intel takes more people with non-tech degrees than the other IWC designators.