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Not officilly no.

The forge world rules for imperial militia give you quite a lot of options for building the army you want to build.
The Dracosan is a Solar Auxilia unit IIRC, so you could run an allied imperial militia and solar Auxilia army to use all of those models in a 30k list.

To use them in 40k, proxy would work. If you are lucky they will get 8th Ed 40k rules.

Almost all FW models can be used in some form or the other in Heresy lists.

This gives a good run down of militia

https://1d4chan.org/wiki/Warhammer_40,000/Tactics/Imperial_Militia_and_Cults_(30k)