If you can, while you're doing all these suggestions, make a detour into your base, and plant some high quality serrated discs and spiked ball traps and see if the undead can blend. A cluster of 10-pack ☼blenders☼ (Corkscrews(3x slice) and discs (1x slice)) and ☼tenderizers☼ (Spiked balls(3x bludgeon) and warhammers (1x bludgeon)) ought to at least slow them down sufficiently, or turn them into a an undead slurry. The spiked ball traps hit 3 times each strike, as do corkscrews, but glass discs also chop at 1 slice per device, whereas corkscrews and spiked balls hit 3-times with less chance to hit. Make them from glass for a denser/sharper cutter/tenderizer, instead of wood (even though oak is the heaviest/densest of the surface foliage for use of this purpose) at a cheaper price than metal (silver being top-most quality for such in sharpness and density; although candy-discs and corkscrews do the finest mincing job at ☼top-quality☼; though the balls, not so much, regardless of quality).
I mean, even a deca (10-set) of wooden ☼spiked balls☼ made a fresh emu (prime condition, no wounds, etc.), and some unfortunate kobolds, disappear in a split second on contact. Imagine what it can do to the undead, especially when made of metal (especially silver) or glass (cheapest to produce value-cost-wise for value-produced; especially if magma-forged (especially where green glass is concerned)). back those balls up with some slicers, and you don't really need much to protect yourself, aside from another backup set in case the first set jams up.