Drop announcement in the discord with testing date and we should get enough people to stress test it. Hell, hit up @Strydxr or @Razana and we might even get CNN hosted on the new client for even better test.
I also don't think that the bandwidth requirements should matter at all, unless it were to really baloon. We are no longer in copper era of internet, so I would assume everyone would have that 1-2Mb/s of upload available for themselves. And considering how bandwidth intensive FAF is, I really don't think that doubling it will matter at all.
And if available I will also show up for some testing games.