Haiku, I'm sorry I haven't yet addressed your questions concerning Houdans. All I can tell you is my experience thus far.
First of all, I have to sheepishly admit that I doubt that Alaska and Crested breeds mix. NH and crested breeds was frustrating enough. It mostly has to do with special attention during winter watering, which, if one has a long winter, can really start to get on one's nerves. This, of course, is rather subjective, though; perhaps it would cause you no bother.
As far as sources of stock that currently meets the standard and is, as is, ready for the farm, well, I do not believe that any exist.
As far as colors go, I would not worry about the White Houdans. They are a relatively new development and could be quickly recreated with outcrossing to White Dorkings. I guess I would say that I'm a fairly firm believer in not getting lost in color. Houdans are first and foremost Mottled Houdans, and they are in desperate need of support. Moreover, if anyone is going to do it, it is going to take a heck of a lot of dedication and a strong stomach for breeding heavy and culling ruthlessly.
As far as stock goes, I would probably start with a big shipment from Hoffman Hatchery. Their stock is of good type--much too small--but of good type and prolific layers. I'd probably want to outcross to something with more size. MMCM Houdans are pretty sad--moment of silence--but they are generally bigger than Hoffmans. I might experiment with someoutcrossing over female Dorkings to bring in good size while maintaining type. Yes, I think Houdans are going to be a heck of a project. Patience and single-mindedness will be the bedrock of a successful program.