Is there a consolidated list of what countries are in each zone for points earning yet? Had a little play around and UA have some Japan-Guam fares that aren't insane and would get you 400 points return.

Edited to add you could do something like FUK-TYO-SPN-GUM for (Y, Z, Z) which should net 520 points for about £580/€660.

Second edit to add you could nest a GUM-MNL in P for another 400 points and £750. That's almost half way to SEN in a week or so with the rest having to be on LH Group metal.