I have not tried making USB with those ISOs made with isomacprog, but it should work. My Mac Mini 2007 has working combo drive. Also I have external DVD drive that seems to work with everything. So may be worth getting external DVD drive.
You can also use another computer to install to a hard...
I found a helpful webpage by Matt Gadient which uses a little program called isomacprog to create an install ISO to burn to DVD that boots in 32 bit and installs 64 bit Linux OS. Works great!
https://mattgadient.com/linux-dvd-images-and-how-to-for-32-bit-efi-macs-late-2006-models/