I haven't posted for a couple of weeks, but I have successfully pushed on with the Numidians bit by bit.
Big decisions - I decide to cancel the head-swap, as too fiddly and a bit pointless; I go fully with Carthaginian "Hellenic" style foot to stand in for the Numidian "Roman trained" Blades; I carefully cut away the oddly-positioned spears of the Numidian light foot and give them each a pair of short javelins instead.
What else? I scavenge a "retired" Numidian rider who is a failed Irish LH rider, and he becomes a General mini for the LH variant; I use a Carthaginian as one of the "Iberian guards" of the Cv Gen element and a Carthaginian horse for the General mini of that element.
The other "big thing" I'm trying is to do as much work as possible to minis still on the sprue, adding patches later when they are ready to mount. It's a partial solution to having a lot of minis all much the same in outfit and colour.
At present I have a lot of sienna-skin, grey-clothing painted Numidians, waiting for highlights.