I got some help from the devs to get some support for the PS1 EA NHL titles from 98 onward. However, if you want to actually use it to its full potential, you'd have to shill out $10, which is a really great price for something so intuitive. Don't expect to use it for editing the databases, however; I tried getting them to add something that can convert the .dbf files to .xml, but the best they could do is extract some files from them that may not be that in-depth.
As for NHL Championship 2000, the .p3d and .dat files in the PC version are supported by Game Extractor, which were files I had always wanted to mess around with.