Doesn't sound hopeful. I think the CHEAPEST way to do this via transfer is to find someone who's willing to lend you the OnePass miles, then have them transfer 60K to your OP account. This will cost 1.5 cents/mile, which is $900 for 60K. Then, of course, they'll want the miles back, which will cost another $900. Plus you'd have to accrue enough OnePass miles to do this. It doesn't sound like you plan to accrue in OnePass, so it will be hard to find a lender.

I think on FT there are some threads to help one another out. By this I mean, you find someone that needs 60K Mileage Plus miles (that you apparently have) and has 60K OP miles to give. Then your ticket gets upgraded directly from that person's account, and they get their upgrade or award ticket (or whatever) from yours. No transfer fees. I've never done this, and don't know if any of it violates the TOS of the FF programs or FT, etc., so you might want to proceed with caution. It's the only way I can think of though to do what you want without paying a fortune in fees.