That would work. The floating license is going to require that your IT department allow traffic through a specific port and running a daemon program on their server. It really depends upon how well you get along with your IT department.
The USB dongle option would also work. You put the dongle on the USB port of the machine with a copy of CodeWarrior installed on it and the tools work. No need to get the IT department involved.
Either option is fine, it just depends on which is the better choice for your situation.
---Tom