The best bridge from an iMac G4 17" to a Plus is to use SCSI - either an external HDD or best is a SCSI Zip drive. Zip 100s are plentiful and cheap, and very versatile for that sort of thing. Use your iMac to set up a Zip disk with a compatible OS. Opinions vary but I think MacOS 7.5 is the best utility version. Also add Disk Copy and images for a system disk, which you can download after some searching. Move the Zip drive to the Plus, then boot from it. Then you can make your new system floppy on the Plus, using the resources on the Zip.

By G4 17", I'm assuming you mean the Lamp. It has no internal floppy drive and in any case you are much safer to make the disk in the actual drive that will be using it.

The problem with free stuff is you often have to spend something to make it work 8-o

Rick