Honestly, if you can't update the firmware you're in the same situation... knowing that you have a critical vulnerability and unable to fix it.
Enforcing trusted operations is definitely more work than they are going to do (if it's even possible to "do this right").
In a semi-ideal world, I would look for a vendor that permits only certain ops from a flashed image and hope that their crappy "restriction enforcing" code is also riddled with vulnerabilites so it's really just "follow the rules please".
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I feel like I'm missing something here.
Honestly, if you can't update the firmware you're in the same situation... knowing that you have a critical vulnerability and unable to fix it.
Enforcing trusted operations is definitely more work than they are going to do (if it's even possible to "do this right").
In a semi-ideal world, I would look for a vendor that permits only certain ops from a flashed image and hope that their crappy "restriction enforcing" code is also riddled with vulnerabilites so it's really just "follow the rules please".