I bought the DX/D2 logo changer before I moved to Liberty and it was I think a buck or two, no more than two. JRummy made it and I'm glad I bought it, when I first flashed back to Apex I was like dammmit! but then remembered I had that purchased, downloaded and changed it back to the Blue Moto that I liked and didn't have to flash back. Your choice tho but that is so easy to do and doesn't cost anything at all. He also keeps updating it and there are like 50 boot logos to choose from.
But to answer your question, if you nandroid Apex before you do this, restore Liberty and change the boot logo, then restore that Apex nandroid, that should do the trick I would think.