Amiga 4000T 5.25"?

[Matt_H]

I'm not sure which 5.25" floppy drives are compatible with the standard Amiga floppy controller. You could gut a Commodore one (what's the model number, 1020?) to mount internally, or hook up a standard one via a Catweasel.

[Matt_H]

For writing PC disks, the Catweasel is a bit overkill  I guess it's an option though since what I am trying to do is write older disk formats in general (you should see the amount of computers I've got lying around here ).

If a standard 5.25 can be hooked up to the onboard FDC, I'd rather go that route for now.

What you're describing is exactly what the Catweasel is designed for. I think that's your solution.