That should do it for you.
You can still get the Signalink USB working on the radio while you are waiting for the cable.
You should at least be able to decode signals and transmit with no shift if you want.
I run 30 - 40 watts into a DX77a antenna and do fairly well.
If you try to run more than that you will heat up the finals a pretty good bit and maybe damage something.
30 - 40 watts seems to be enough to get the job done OK.