I'm not going to be a ton of help for you, but I do have something I think is important to say.
If you find someone to do this, make sure they have done other PS2 mods already. Don't just find someone who is a decent solderer, or someone who modded an xbox, cuz IMHO, they are totally different, and the PS2 is lightyears ahead as far as difficulty is concerned.
Good luck, a modded PS2 is great. I have one too, but I bought it modded after seeing what the install for a chip was like.