Fumbling the ball. That is what Hallicrafters did in the early 1970's when they introduced the FPM-300 Safari. This radio was an all band SSB CW transceiver with built in power supplies for 12VDC and 120VAC, thus the connection to a Safari. A Hybrid rig, it has two tubes and the rest solid state.
The fumbling part involves a cranky drifty VFO and a rubber band operated band switch where the rubber band would fail, and the band switch got out of sync.
I bought one 10 years ago and could never fix all of the problems, so I kept the main board and S Meter and sold the rest as parts. From these two pieces I designed a solid state QRP radio. The receiver is actually pretty good once you rid yourself of the albatross Hallicrafters circuits associated with the VFO and band switch.
My efforts involved taking the mainboard which had a 44 Pin Edge Connector and discerning how to interface those 44 pins to make a working Transceiver. My mechanical band switch has 2 poles and 5 positions. One pole gives signals to change the Arduino/Si5351 to the various bands and the 2nd pole supplies power to banks of BPF's and LPF's.
This is where being a real homebrewer versus a kit builder shows its true colors. There was no circuit board nor bags of parts supplied. The SS FPM-300 had to be designed and engineered. You also had to have skills with the CNC Mill. Those holes in the front panel were machine cut. The Dial Plate for the Band Switch was also made on the CNC.
There are no Bitx20 circuits or TIA amps involved with the design, and it works just fine.
Them that know can make it go.
73's
Pete N6QW