[Sombre]

I've tested this with lizardmen and you don't even need to differentiate the summoning form from the normal form, because when you recruit them, this happens before EoT, as does the summoning of their troops, so they summon the troops, then they change shape and become normal. In other words, no delay between hiring them, them summoning and them turning into the normal version. So you can literally just put in the description that whe you buy them you get X free dudes.