You can Jep, just use thin coax like RG174 or similar for in and out lines and put a pot on front panel.
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Some here have done it.
At 15/06/2020, you wrote:
Evan and Raj,
Thank you for the limpid suggestions; then I will consider installing a pot with a long axe to avoid long wires travelling over the circuit board.
Alternatively, as I do normally use the ubitx for the 40m band only, even a simple switch and a small relay to select hi/lo power could be an easy approach to reduce power at the level required by a Ten Tec 405 power amplifier.