This is a later, QRP version of a 706. Not many sold, but W2AEW has one! How about supporting it?
W2AEW is such a gem. If he has one then it must be good!
If you set the CI-V address on the 703 to the same address as the IC-706 it should be good to go.
FYI the command set is quite limited but if you wire up an interface you can indeed use it remotely.
—E
de W6EL