PPA Mirror for China available?

Due to the “Great Firewall” all self-hosted PPAs are incredibly slow when accessing them from inside of China, so upgrading Collabora is a drag and takes several hours - if not fails. It’s a pity, since packages hosted on Launchpad do not get affected at all. There is no specific issue about it concerning tech, but a matter of whitelisting decisions handled by the authorities. This of course does not only affect us, but the whole Chinese market, which directly translates to “a vast user base”.

Is there a mirror available, or are there any options to also host the packages on Launchpad? Or any other standard Debian repository?