Never heard of that (just that you get into the relevant menu, when device is off and even then need to navigate actively to the relevant menu) but honeywell may do it different (?).

But back to your question: Check if you can disable it using the honeywell oem config app (depending on the Mobicontrol version you use, you can provide the app via app policy and the configuration via profile which i would recommend).

And if i follow the features listed here: https://sps-support.honeywell.com/s/article/Honeywell-OEMConfig-for-MDM-EMM-UEM-solutions
Key remap should be the one you are looking for maybe.

Otherwise you may need to enable FRP (Factory reset protection) in general but be very careful with that.

Legacy MobiControl script commands

    hardwarekeys -keys  ##  /block
    hardwarekeys -keys  ##   /unblock

can be used to disable/enable certain hardware key event on Android devices.  ## is the key event number.    However, not all device brand/firmware versions are supported and you have tp test on your own targeted device(s). 

Also, I don't think there is any key event code for  hardware-reset (power + volume-plus)  combination.  You can check if blocking either one can block also the combination on your test device model(s).  Even so, using this approach has the side effect that ALL apps using the same blocked  physical key for some specific UI/UX interaction(s) will ALL have such interactions not usable within the corresponding apps.

Maybe this provisioning.xml could be useful..?