Well, it's done. CPCEC 20200229 is out, with Amstrad Plus emulation, source files within the package, everything.
The license problems were more of a big misunderstanding than anything else. I was actually quite dumb and I should have asked the questions much sooner :-( Besides, some titles gave me trouble until very few days ago.

The less I say about demos the better, too...

Still, CPCEC and ZXSEC are coming closer towards the goal of "dogfooding": organisations ought to use their own products, don't they?
EDIT: the original upload had a mistake because of a dumb oversight (saving changes AFTER compiling the files!); I replaced the package two hours later.