I misread some of it, but does this part not help?
(i.e. being able to call export namespace {} without wrapping the file in
it)

export namespace {} // error: does not introduce any
names*namespace has internal linkage*




On Sun, Sep 4, 2022 at 1:25 AM Jason McKesson via Std-Proposals <
std-proposals_at_[hidden]> wrote:

> On Sat, Sep 3, 2022 at 2:09 AM Zopolis0 via Std-Proposals
> <std-proposals_at_[hidden]> wrote:
> >
> > On further research, P2615R0 appears to present a solution to this under
> its #[module.interface] modifications.
>
> Can you explain how the cited proposal does any of the things that you
> want?
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