@ gawward
I realize this is a year late

, and most likely you've already discovered this by now (or sadly have moved on from this project) but just in case you're still looking for a converter, try
Ps2 Save Builder 0.8x.
It converts the PS2 OF from .max to .xps so you can edit the OF with PESfan Editor 5.08. Then convert bact to .max to play on the PS2.
PC OFs can be edited with PESFan editor without conversion but I have yet to find a tool that converts PC OF into PS2 OF.
The way I do it now, is to first get an original PS2 OF -> convert it to .xps and open it in PESFan editor. Then open the PC OF in the editor by going to "File" -> "Open OF2." After that, you can import the data from OF2 -> OF1 and voila you have a PS2 OF (after converting to .max off course

).
The main problem with this is that if the PC OF's team line-up (ie under the editor's "Team" tab) is not the same as the PS2 OF's line-up, the data update intended for one team will go to the wrong one (which leads to more work for you to do

).
If anyone knows how else to convert a PC OF into a PS2 OF with line-ups, appearances...etc intact, please share it.