Alternative GrapheneOS is open to collaborating with most OEMs, and I would be enthousiast to Sony, but I wouldn't expect it to happen initially. GrapheneOS has announced that the device will be a model without a 3.5 mm audio jack, and Sony is a very conservative company that does not currently sell its mobile devices in the US and Canadian markets, which are large markets. At present, it seems more logical for Sony to extend its proprietary Android-based operating system from its Xperia phones to its Afeela 1 electric cars built by Honda.
shadowbeany I wish it was Fairphone, but don't think so.
GrapheneOS will never collaborate with a manufacturer that spreads misinformation about GrapheneOS, about security/privacy in general, and that partners with a for-profit company for the operating system that attacks GrapheneOS and the community.