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I'd also be tempted to convert some using a mixture of the Frostgrave plastics. Crewmen and Cultist sprues, and also perhaps get some of the older GW undead sprues with lots of skeleton bits? (Or of course Wargames Atlantic and Warlord)
It is a real shame you can't get the GW Empire Militia sprue any more, as combined with the GW zombies (which are still available, with new round bases!) they used to make for 'fun' zombie pirates ...Of course, other people would probably not paint them in a cartoon style! When White Dwarf had the Luthor Harkonnen (?) list of undead pirates GW put out mixed sets of zombie and militia to encourage this sort of thing!