How can I get Inovelli central scene support?

Your scene config only has entries for scenes 1 and 2, you need another for scene 3.

			<CommandClass id="91" name="COMMAND_CLASS_CENTRAL_SCENE" version="1" request_flags="4" innif="true" scenecount="0">
				<Instance index="1" />
				<Value type="int" genre="system" instance="1" index="0" label="Scene Count" units="" read_only="true" write_only="false" verify_changes="false" poll_intensity="0" min="-2147483648" max="2147483647" value="2" />
				<Value type="int" genre="user" instance="1" index="1" label="Bottom Button Scene" units="" read_only="false" write_only="false" verify_changes="false" poll_intensity="0" min="-2147483648" max="2147483647" value="3" />
				<Value type="int" genre="user" instance="1" index="2" label="Top Button Scene" units="" read_only="false" write_only="false" verify_changes="false" poll_intensity="0" min="-2147483648" max="2147483647" value="3" />
				<Value type="int" genre="user" instance="1" index="3" label="Config Button Scene" units="" read_only="false" write_only="false" verify_changes="false" poll_intensity="0" min="-2147483648" max="2147483647" value="3" />
			</CommandClass>

Another user created config files for HA which creates the scene values for you.

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