you would need to mash to use the pale malt & its not necessary to use with those other 2 grains as they are already converted, 250g of pale malt won't really add any flavor either. if you plan to use specialty grains, I'd use light extract instead of dark to start getting a better understanding of the grains, otherwise you don't really know whats being added. personally, I'd replace the pale with roasted barley or more chocolate/carafa and maybe add some crystal malt if desired
i wouldnt really worry about the hops, more or less any hop should be fine as a bittering add & late adds wouldn't be needed in this
anise, vanilla, cocoa, peppermint, cinnamon, or licorice would all be fine spice additions for a xmas ale.