Someone made a start for a wikia here: http://psp2-infinity.wikia.com/wiki/PSP2_Infinity_Wikia

If you got some time and want to help add to it, you're welcome to do so.
I think that a lot of the data can be copied from the existing Japanese wikis, so if you're good at handling data and know some Japanese (or know how to use a dictionary), all it takes is time and dedication to get it off the ground.

I feel having a proper front page where stuff links together would be pleasing as well.