So I guess in the end to get stuff similar security to graphene I would need to do a custom build.
Not really. There's not much security needed on an android besides keeping security patches up to date. I'll say it again. The only security flaw an end user of android phones really needs to worry about is ignorance. If it looks questionable don't click it. You should be less worried about security and more worried about privacy. The more private your phone is the more secure it is.
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