You need the Race of Men in order to research the tech Henchmen.
If you choose a custom race with the race of men, then you should have access to the henchmen tech.
There are ways of giving this tech to you otherwise, for example, just make it a trait that costs 0 points and you can choose all the traits you'd like.
As to the generic_other unit types you can only have 3 (that's it 3). Male Female and Other. So, you will have to measure these abilities seperately. But doing exactly what you are doing you will fail to understand the mechanics of the game as you are changing the mechanics of the game (quite a bit).
Another technique is to build a faction of every blood type with the same EXACT name. This will enable all troops to be trained for you (just a simpler way to do what you are doing).