I don’t think it’s feasible to go KUKF.
Too easy for US to reinforce from sea zone northwest of London if Germany lands fighters at Western Europe, or southwest of London if Germany lands fighters at Norway.
Russia has more IPCs from the Europe territories to fight off Japan; Germany has to try to protect its navy and ground at the same time. Germany and/or Japan can make a run for Africa, but if they do, that either lessens pressure on Russia (if Japan goes for Africa), or allows the Allies to quickly secure London and move on to air production (if Germany goes for Africa), either of which situations is IMHO not favorable for Axis.
Of course, if you are going to transpose that game into a KRF, it might have possibilities.