Yes, as Vovk_Z stated, you can do that. But I thought you wanted a ready made thing. If you plan to replace the regulators in what you buy, you need to consider the other stuff also like the caps and anything else there may be. Then the whole idea of "ready made" goes out the window!
In this case, you might as well design your own circuit based on the HV versions of the regulator as in the spec sheet you referenced. Why buy something that you need to modify? Not to mention you will be replacing the most expensive parts on that board. Does not make any sense.