What models would you use for HH era Word Bearer Chaplains?

[Stumpy Heaven]

Working on a 30k HH era Word Bearers army as my first entry into 40k but confused over selecting the right figures to use as Chaplains and Legion Praetors.

 

While 'The First Heretic' states/suggests that WB Marines did become daemon possessed early on Im not sure how wide spread that was and whether or not its appropriate to use GW CSM figures for HH era Chaplains or whether standard Space Marine models would be better.

 

Forgeworld has a good range of Marines and command upgrades but no characters as yet except for the MkIV armoured Apothecaries, Std Bearer and Legion Captain none of which seem suitable for a Praetor or Chaplain/Apostle character of that period.

 

Any one have any suggestions?

[Durus]

Maybe Cassius with a headswap and some conversions.