Table A-3 in E1.20 makes it clear that if you only support the required PIDs you do not have to support SUPPORTED_PARAMETERS.
That being said, I'd strongly encourage you to support DEVICE_MODEL_DESCRIPTION, MANUFACTURER_LABEL, and SOFTWARE_VERSION_LABEL. These should be easy to implement for most responders because you don't have to calculate anything on the fly, all they do is return a string.
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