Here's another solution. Get one of kits and install it between the TX/RX relay and the front end, just as for the popular AGC circuits. The output can be clamped down with a transistor fed with control voltage from an audio module.
I used a spare module lying around, and added a diode and capacitor to rectify the output to [near] DC that varies by audio amplitude. That feeds the clamping transistor, which shunts the preamp output [which has traces for an attenuation pad already] through a 47k capacitor.? A manual control pot to feed clamping energy was added as well.
This near-short at the preamp output (isolated from the preamp by 100-ohms as R6 below, first) more than handles the preamped RF; it shuts all RF down to well below naked, factory sensitivity AND still allows the extra pickup some operators may enjoy. Not that he ubitx lacks sensitivity, but preferences vary.
Ted
K3RTA
Ted