[@Frengo] You ask many questions, I like that.

At this point the Imperium does not see the Consortium as a huge threat, yet it has sent hundreds of vessels and, as you say, millions of warriors to deal out Imperial justice to the misguided.

Can they go toe-to-toe? At this point, yes, there are Astartes and others with the crusade, but not enough to swing the balance massively toward Imperial victory against a whole system of unified planets. As time goes by, depending how it all goes, more manpower may be poured in...should word of it even reach Terra...

The RP will likely start with a space battle and landing - think D-day with huge spacecraft - forces making planetfall as huge ships blow one another apart above.

All very dramatic.

As to your idea, I have no problem whatsoever with it, and would actually welcome such a basic - but completely fine - fighting force.