Whilst thinking about solutions I saw a reasonably priced Icom IC-706G for sale. I appreciate the radio doesn’t have cutting edge performance, but it is not much worse than the FT-847 . As a result I took the plunge and I have spent some time setting it up with my RRC v1 boxes.
The picture below shows my two RRC boxes in the loft “shack” attached to my TS-480 for HF (right) and IC-706G (left). There have been some RF feedback problems, so I have had to attach large amounts of ferrite to sort this out! The box at the back is a Cross Country Wireless duplexer to split the VHF/UHF port to the respective amplifiers