There have been suggestions such as deleting the DCS folder in the Saved Games folder but that didn't work for me.
Something my friend and I discovered though is that for whatever reason, setting a keybind for the toggle LHC/RHC control and pushing that somehow makes the keybinds work. With the exception of the mic, I can use everything else like the castle, coolie and triggers on my LHC/RHC.
I haven't found a workaround for the mic keybinds in the WSO seat yet.
For the record I use the CM3 as my LHC and a Gladiator Evo as my RHC.