It really looks I'll have to keep my Jolla sbj1 forever in reserve even as I have switched using ported Nexus5 as daily driver...
I had thought of selling or donating it but it seems I just cannot.

Since the Nexus only sees a limitd selection on Harbour (just the same 16 apps always, never more) I need to first download anything new with sbj1 and only after that I can install them to Nexus with pkcon/zypper...

I understand the core reasoning; Jolla cannot allow ported devices free access to Store since it is about the only proprietary part they have and using it is good for the licencing deals.
However it would be nice if those users that have registered their Jolla account with a genuine device could access it with ported devices too.