I don't think a buildbot will be necessary - like the earlier compilers, they may have basic support but they don't all get buildbot support.  The "problem" isn't the lack of ability/will to get things working with VS2010 - it is more the lack of incentive to add another compiler to the mix.  OTOH, seeing it is nearly 2012, a case could certainly be made to move 3.3 to that compiler :)

I'm interested to see the patch required to get it working - almost every other upgrade has been almost handled completely by the VS upgrade process so it would be good to see how different this one is - so please CC me on any new issue you create.

I'm also interested to know how mixing the CRTs is causing problems - are you using the very few Python APIs impacted by such mixing, or is the issue more about needing to redistribute both, or something else entirely?