1) OP have 25000 BTC.
2) OP wants to create a second block chain, but to offer a way to transfer BTC from one block chain to the other (which involves creating a transaction that looks like a "destroy" to the original client)
3) OP won't convert his BTC, and also expects that nobody would convert BTC mined with an easy difficulty because it would yield so little.  Only recently mined BTC during high difficulty would make sense to transfer because the yield is directly related to the difficulty.
4) The BCP will become more valued than the BTC because there aren't millions of easily-acquired BCP out there waiting to pop the market.