im not galka, but i am elvaan with hp merits. youll have to put more effort into your build than mine, but you should be able to get there with only 1 piece of zenith if you dont mind shelling out for more expensive items like astral earring and serket ring.
a good place to start is to check what items you carry already that lower hp. when i started mine, i already had zenith crown, penitent rope, rostrum pumps, errant hands, and a star necklace from a long forget mid level bard set, which gave me a 135 hp into the build before i even had to start shoping.
some items that drop your cheap and are fairly cheap:
electrum ring (although youll probably need serket)
not sure what the rse2 looks like for galka, but i know the elvaan hands are -55hp which is nice if you dont have zenith.
another thing to remember is that convert hp -> mp gear doesnt lower your maximum hp in terms of the calculation, so if you are already wearing some zenith you are already part way there. lastly, i had to learn the hard way that +hp items in some slots dont count for some reason (when in nuking set), back being one, and i dont remember the other offhand, but it wasn't one i was using.
but having said that, if you are unable to get the items to lower your hp that far, you could temporarily raise your hp in nuking set to counter it to a
degree with items like oracle's robe, walahra turban, bomb queen ring, etc.
edit: i forgot to mention, a good club/shield combo that is both r/x (aka freeish) and drops 55 hp is askelopis/astral aspis.
Edited, Apr 4th 2009 3:21am by Buront