'Pure' Custodes in 8th?

So, in a fit of fever induced madness, I got to considering a pure Custodes force in 8th...

Unfortunately, as my grip on reality became stronger, a couple of small issues came to mind. Namely the fact that 40k Custodes lack any kind of Fast Attack or HQ choices of their own, and being the staunch Battle Forged player I am, I need some of those.

So I figured I'd go ask Reddit, if you were trying to keep as pure to the shiny golden guardians of legend, what would you pick to command them on the field?

Inquisitors were first to mind, but I don't know if I'd feel right having an Inquisitor in charge of the Emperors finest... Maybe I could cheap out with Primaris Psykers or something?
As for FA choices... I dunno, maybe Land Speeders?

Anywho, I'd appreciate other peoples thoughts on this, I just figured it'd make a different force to my usual mass of Imperial bodies and tanks.