If you want to try recovering the rest, keep in mind the 1541 is notorious for losing head alignment. For 1541's that's been used a lot you can pretty safely assume that it won't be properly aligned, but even if it was, chances are your disks were last written by a 1541 that wasn't perfectly aligned...

Look up how to adjust it, and chances are you'll be able to recover a good chunk of the rest. The "crude" approach is to just manually try adjusting the alignment screw, but there are proper instructions online and software to aid finding the right alignment.

(and the 1541 didn't have just it's own ROM - it has it's own 6502 CPU - it's as powerful as the C64 itself... And you can download programs to it over the serial port)