Graphene doesn't really try to stop you. They just don't spend their own efforts on making it possible. It is OSS so, your free to spend your efforts where you want to.

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fsflover an hour ago | parent [-]

This is however not their main argument. I doubt they would accept such pull request.

	▲	handedness 14 minutes ago \| parent \| next [-]
		It would require a significant commitment of limited resources to broadly support insecure devices with very little upside, and to do so would constitute gross mismanagement of the project. Meanwhile, others are completely free to fork numerous GrapheneOS improvements or benefit from their upstream improvements (as some have, including Google). Why can't you understand that?
	▲	limagnolia 39 minutes ago \| parent \| prev [-]
		No pull request necessary, forks don't require approval.