Conversation

If your laptop was purchased recently from a decent company, it will at least have firmware updates for all of the major components including Wi-Fi and Bluetooth, and you can apply those by keeping the OS up-to-date as long as it's decent. Of course, you did say *Debian* so...
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But I don't see how that makes it a good idea to use a hardware platform where security is an afterthought and it's worse in so many ways than a mainstream device. GrapheneOS could not offer the security or functionality it does today on that device, so why bother? How I see it.
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Perhaps you just want to make a device that's an appliance with a web browser and end-to-end encrypted chat / voice client. That sounds interesting. Linux doesn't seem important to that. It could be a single verified image with no dynamic code, and the Linux kernel is overkill.
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