Firstborn 1st Company Veterans or for current classes expansion ( UPDATED)

PvE co op rank progression : you can , through experience on the battlefield , ascend tò the rank of Company Veteran (not the Sternguard or Vanguard Veteran, i mean the more "generic veterans" )and being able , like the miniatures and lore wise (see "Company Veterans " on the internet) to have/wield a bolter/Bolt rifle/stalker bolter /storm bolter on one hand and a chainsword/Power fist/ sword on the other hand ,and other different loadouts and playstyle for each veteran class and of course , a new whole perk tree for that specific veteran class (those classes playable without limited numbers of times or conditions , just like the base classes currently in game). i think It would be so nice to have those cool units by expanding the current classes in the game given that i saw "Prestige Ranks " in the roadmap , why not taking this opportunity to implement them along with that feature in order to expand the current classes ? I know they are firstborn (the older editions Veterans) but It would be so damn cool to have them. You can introduce them as firstborn marines that underwent the Primaris Rubicon surgery but retained their old traditions in terms of equipment and combat warfare , and their armour have been adapted by the mechanicus to fit their bigger size

Or , given that you devs stated that there will be face customization for our characters , you could just introduce them into the game starting as firstborn recruits at first and we level them up to become first company veterans (with their weaponry , old mk armours etc.. ) . In that way, we would have more progression and time investment into the game and also , more gameplay variety by just having them in the game

Here some examples : 

As you can see , their weaponry choice is  wide and could grant a very diverse and unique gameplay