I made this for myself and I'm uploading on the offchance someone else might like it. It bugged me how the Dawnguard NPCs added by Dawnguard Sentries Plus only used the vanilla Dawnguard weapons when my game has so many nice Dawnguard weapons to choose from by talented authors. All this mod does is add weapons from Dawnguard Arsenal, RFM and Artefakes into the DSE levelled lists so that they have a chance to spawn with any weapon.

NPCs who use one handed weapons will draw from a list of one handed weapons, and likewise for NPCs using two handed weapons who will draw from a list containing only two handed weapons. NPCs with unique weapons remain unchanged, and all Dawnguard NPCs now have a very small chance to spawn with a helmet. Volkihar guards are unchanged.

If you already have Dawnguard Sentries installed and install this mod mid-game then you may need to resetinventory on DG sentries with console when you see them as they may be missing their original weapon. (Open console, select the NPC, type "resetinventory" and they will refresh their inventory.)

This mod edits levelled lists so you'll need to rebuild your bashed patch.

Requirements:
Dawnguard Sentries Plus
Dawnguard Arsenal
Reforging - To the Masses
Artefakes

Optional version available for Ks Hairdos for Dawnguard Sentries which will also require Ks Hairdos

My other plugins
More Skill Trainers
The Great Town of Shor's Stone - Deserted Fallowstone Hall
Vine Boom for discovering locations
New Legion - Rusty Armor Integration
Dawnguard Sentries - Unplayable Faction Armor Integration