For the Ranged-Option I suggest:
BM>Enchanter>Thauma [If you want to go unmounted]
or
BM>Enchanter>SR [Mounted]
Still missing the BM synergy it had in the archer-tree (Quick-moving mainly; still good though)
that’s why I actually suggest a melee-option for the AA-build:
Corsair>Enchanter>Assassin [Yes, in that order]
The ASPD-buff of Assassin combined with DualWeaponAssault of the Corsair will probably break your fingers after 20 minutes but that’s what you’ve been asking for after all. In any case is it important to note that Scout itself already has a very nice buff that gives SubWeapons a 40% chance to add a second attack on hit, which in turn add another line of Enchanter-buffs on the same attack. That’s why BulletMarker and Corsair work so well as both make the best use of SubWeapons AND Enchanter-buffs.
Also, kinda surprised about some suggestions people made here. He was cleary asking for an AA-build and here I see people discarding all the tools one needs for a proper AA build: ASPD and Damage-buffs.