Proxies

Since Dystopian legions is no longer supported, official miniatures are no longer manufactured.
The original models were sculpted in 32mm heroicish scale.
There’s a large amount of variation between the exact heights to reflect that people vary in height in the real world.
In order to put together a force there are four broad possibilities:

28mm Scale
If you’re starting an army from scratch, this is by far your best option.
If you’re expanding an existing force, putting 28mm models next to a 32mm one does look a bit like bring your child to work day.

32mm scale
If you’re trying to expand an existing list this is your main option.

28mm Female miniatures
It is ahistorical, however several companies make 28mm female soldiers. These look fine when placed next to the existing dystopian legions range.

3d printing
Any model can be scaled to any size so this is a very viable option if you can find sculpts you like.

Warlord games and Perry both produce Zulu war british infantry in 28mm.
These are very cost effective.

Victoria miniatures do a set of female Victorian guard which are a solid match.
Anvil Industries produce female guard which can be built to resemble line infantry.

Dust 1947 are really the only option here. Sadly production stopped in Oct 2021.
There's still a lot of stock floating around though.
This heavy weapon crew can be used to make HMG

Sadly we haven't yet been able to find any of these.

Sadly no luck here yet.

Sadly no luck here yet.

Warzone Resurrection's Mishima are a very solid fit.
The models are long out of production but if you can find them they are usually cheap.