there are quite a few coaches who do exactly what you are saying... keep their d3 team and also move up. but in order to do it you need to create a second user id.
also, you would have to wait until the new coaches signup period which is probably a couple of days from now.
and it is possible that someone could grab philly bible before then.
the bigger issue is that your d2 team .. hilsdale, is only 600 miles away from philly. the fairplay guidelines say you can have a second team within same world, but hey have to be 1,000 miles apart.
now, as much as i would like that to be the end of it... i will tell you that i suspect there are quite a few users who violate this rule. it does not appear that WIS has any system in place to enforce this 1,000 mile rule. im almost positive they dont check it as a regular course of business. im not sure how they handle it if a fellow user reports to them that you are breaking the 1,000 mile rule. i assume they make you change when it is pointed out. of course, you could also deny the second id is you, possibly saying it is your brother or dad in case it is ever questioned why the credit card is the same.
anyway... i would suggest sticking with one team one world. its the right thing to do. i know its hard giving up a d3 team that youve grown attached to, but you'll get over it.