I have a 2014 MacMini in a rack in a closet running 24/7. On occasion I can't remote desktop into it, and need to. Instead of buying a monitor, I have an unused 2009 iMac with FireWire 400 and 800 ports on it that will boot into target disk mode. Can I use a Thunderbolt to FireWire dongle and FireWire cable and get Target Display mode to work with this setup? Thanks for the help!