Are you unhappy with Empress Miniature's products which already covers that era?
No, quite the contrary, I love them and I have the whole lot, but Empres makes only Erithrean Askaris, not the Lybian ones. Italy had plenty of Lybian troops, and while not as reliable and sturdy as the good old Eythreans, the Lybians would make a colourful addiction to any Italian colonial adventure. Have a look at the links, these guys wore a different hat and at least at the beginning also had a different uniform.
I had actually asked the guy who was running Anglian miniatures before he sold them off to Empress and he said he intended to cover all the Italian troops, the Lybians, the dubats, and so on, but since the ladies took over I think they are more interested in exploring new lines (see their recent ECW range) than in deepening what they already have