I think you are fine. The "Schaller" is basically identical to the JT590.

Same bridge. What's wrong with the current bridge?

I have 2 Import fusions, on both I replaced the original floyd with a schaller without any problems

My question is why would anyone want the Schaller over the Original Floyd Rose?

They have different intonation ranges.

import Fusions don't come with Original Floyd Roses, so I assume Nightbat meant the original licensed trem the guitar came with. Which would have been a Jackson licensed Schaller, the JT-590, on a Charvel Fusion. Or a JT-580 on a Jackson Fusion.

I've actually just replaced the Takeuchi on one of my Fusions with a Gotoh Floyd. Not a perfect fit, but works a treat

Problem of an OFR would be the string locking bolts being too long for the cavity

The original looked like it was raped by Godzilla & King Kong so I made one using the saddles & the rest of my old Fusion SX bridge. It works pretty well but I think this guitar deserves decent parts.

Having a 25.5 neck, I need a fair bit of intonation range. So far it's pretty good so I'm hoping a new one will do the same job.

Thanks for the info guys.

@ VitaminG and Axe... Thank you for the knowledge!