Your EXDOS-Compact from Pear has space for a lot of extra Roms. I think that Zozo will provide you an image to program the FlashRom included.
Using Epdos is the "cheap" way for an Enterprise with spare memory to install a virtual Rom, that will last until the next hard reset. You don't need that method, but Epdos is indeed a great file manager with a lot of extras. Ask Zozo to include it on the Roms compilation.
All HxC versions behave the same.
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Pear: Zozo has provided John the Enterprise, so surely it has inside installed the most actual EXOS Rom, no problem with that.