Over the last couple of days I have:
removed the SL30 and the Sigtronics intercom and all their wiring;
replaced the intercom with the new Funkwerk ATR833 radio (it includes an intercom which is supposed to be quite good) and rewired the four headset sockets;
moved the KMD150 up in the radio stack;
fabricated, painted and installed a blanking panel below the KMD150;
wired the KMD150 audio warning output into the radio's auxilliary input;
installed the compass on the central window support using a home "printed" mounting bracket;
turned down on the lathe the throttle knob which was just fouling the P2 control column. The pictures show the before and after configurations.
Overall, 16 hours work, additional cost, and no functional advantage - thanks EASA!