Have a look at this plugin.
I had a need for this, so wrote it; if there is interest in this, I will be happy to send a pull request to be included after gate-keeping due diligence steps are done.
The plugin has two buttons that work with each other thus - if the first one is mapped to an external MIDI controller and the second to a hardware button on the device, turning the latching MIDI on will turn on the hardware button display and off if turned off, and output a CV signal that can be used to control effects on the pe…
It provides an array of 5 pairs of buttons, each pair controlling a cv output. You can map each button to a different control and each cv output to plugin parameters
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