Excuse me for saying so but this is going to cause problems in the multiplayer community. You need to get Firaxis to sponsor this patch and have it as a required patch to install before entering into the multiplayer lobby like other patches, otherwise you are going to split the multiplayer into two versions without being able to identify who has which version, which is extremely bad release management.
This may work for the controlled "CTON/League" Players but when those players enter into the regular multiplayer community they will cause OOS problems as you have stated "but it will cause a first turn OOS if all players do not have this patch".
The regular multiplayer community may be reluctant to install the patch as it is not coming from a confirmed, and accredited source such as Firaxis. Do not get me wrong your reputation is known in the multiplayer community I am sure of it, but you are not a creditable source for patch release.
In Summary -- You are introducing a problem rather than solving one. If you are indeed a "QA Tester" for Firaxis then have them sponsor the patch, and have it released through the proper channel. I have heard some people reluctant to install it because they think it may be a Trojan.