I have an idea and I don't know if its good or just gay cringe.

I want to play early Heresy Word Bearers. I want them to be in grey armour and dressed up like holy nutters, with all the trappings that come along with that. Guys who have been fighting the Crusade for 200 years in the sure belief that they are doing God's work.
However I still want Gal Vorbak. They will still be daemonhosts and my army will still be Traitors. However I want them to pass for mortals, because they've been playing the role of Loyalists for the last 50 years. So I'm thinking of modelling them as holy champions or paladins, instead of the usual daemonic appearance. Sacred weapons, halos of light, purity seals, burning candles etc. Still 8ft tall and swole as fuck because they are Lorgars elite circle.
Probably base them on BT Sword Brethren but with the more obvious Primaris elements removed.

Any merit to this idea?