Admiral:
@Carcearion: Thanks! Indeed they do. In the 9th Age, Orc Slaves can take musicians, which obviously could be a count-as slavedriver. Very good ideas! More on it below.
@Tertius: Indeed! But if I somehow got them cast in shackled pairs, those pairs would be obligatory and standard (i.e. the same pairs repeated over and over unless someone converted them). I’d love to make them as chain gangs, but it’s probably best to convert one such oneself with the use of some jeweller’s chain between ankles, and leave a link about it where selling takes place to inspire others.
Hobbles might be Hobgoblins. 
Also, from PM since it is most relevant to the discussion:
As much as I would like to see them sooner then later I really think a slave driver kit is the way to go. However I really feel like Hobs are allot harder to come by right now then CD so I’d recommend doing primarily Hobs and probably just the one CD overseer (a cool whip or scourge bit and anyone can make a overseer that fits perfectly into their army, but Hob slave drivers are a basically completely new and quite hard to convert since no one is making Hob models).
Carcearion
Good point. At the moment I’ve started with a single Hobgobbo slavedriver along with the 5 Orc bodies (7 heads). However, what it will all come down to in the end for the slave Orcs will be how many bodies/heads fits into a single standard sized whitemetal mould over at Griffin Moulds. I’d be surprised if more than 10 fit in total, if that many (all extra bodies & heads above the original 5 sculpts will be resin masterclones from Zealot).
The question then is whether to make do with but a
single Hobgoblin taskmaster and to put him in the same mould and kit/s as the Orcs for savings. Or whether to make
a dedicated slavedriver kit in separate mould (maybe in resin production cast by Zealot).
I’m leaning toward the latter, even if it’ll take more time to do (not immensely much longer, though, as long as it’s merely Hobgoblin slavedrivers concerned). Yet if one is to make a dedicated slavedriver kit, how to go about it? One aim is to fit the whole little slavedriver kit into a single mould to keep costs and price down if possible, and if it’s going to be cast by Zealot then numbers need to be low. It’d be 3-4 miniatures maximum for one mould (War Booty price level) or up to 6 miniatures if spread out on two moulds for one kit (Taming of the Wildman price level), I believe, though one could have it made by Czech Custom Made Miniatures which deal in smaller moulds, cast well and are affordable, though take longer time with everything they do.
So, how would a separate slavedriver kit look like? Should it be Hobgoblin slavedrivers only, with e.g. one or two whip gits and the rest with spears and blades to prod the Orcs along? Or should it be one evil Dwarf overseer, and the rest Hobgoblin taskmasters? My guess is that most people would really like to see an infernal Dwarf slavedriver in such a kit. Or do anyone have other ideas on how it could be done?
Please note that I cannot make a
mancatcher no matter how much I want to. Too airy and flimsy for me to ever achieve one without it looking way too thick and clumsy. But maybe some other evil dwarf producers such as 3D-sculpting Lost Kingdoms could provide one if demand is high? Or collectors could just take that bit from the GW Skaven Giant Rat/Rat Ogre kit and convert.
Also, unless the Elf archer kit proves an outright runaway success beyond the most optimistic expectations, the Orc Slaves are likely to go up for funding by Kickstarter. But if so, then no campaign until more or less all sculpts are finished; no one should get to buy the pig in the bag so to speak.
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it would be allot of fun to see all the various model ranges outfitted with that stuff, it would be a veritable rainbow of evil.