Disk2FDI needs a *real* parallel port, and runs under *DOS*. A USB parallel port won't work because it needs to twiddle the actual hardware bits via DMA, and it has to run under bare-metal DOS because timing is absolutely critical.
The only possible way I could see to run this on current Apple hardware would be if you could get a PCI-E parallel port card (I Googled, they do make such things... which surprised the heck out of me) working in a Mac Pro desktop. You'd be much better off digging a Pentium computer out of your neighbor's garbage can and using that.