Now, I e-mailed WYeast themselves and here is what they said in response to my situations: "Hi Ed,
2112 California Lager and 2124 Bohemian Lager will both produce clean beers at temps in the mid to upper 60s*F. I would be comfortable substituting either of those in an O-fest recipe to be fermented at warmer temps.
An ale yeast with “neutral” or “clean” in its description will produce low levels of esters, and would also work here – 1056 American Ale or 1007 German Ale would be good candidates, although personally I’d choose one of the above lager strains first. "
They also wrote: "2633 is not one that I would recommend for warm fermentation.
A potential workaround would be to 1, prepare a large yeast starter, and 2, overchill the wort (mid-40s*F or so) prior to pitching the yeast to ensure that the first 24-72 hours of fermentation are at a lower temperature. The combination of a large amount of cells plus cold temps during the first few days of fermentation will help minimize ester production, even if the temp rises up to the low 60s for the last half of fermentation."
So, now the question is whose response should I value more - the people who make the yeast (WYeast) or the people who make and sell the beer and yeast (Northern Brewer)?