I think adding the Twins is good but don't go overboard. maybe have the Slytherins girls flock to Neville, and have them as a powerful back up for the Trio plus 2.
As for Ron, Maybe he can be Filch's assistant!
;-)
Author's response
Not to worry, Dennis,
This is not a Harry!Harem fic.
I think the Slytherins will most likely flock to Blaise.
Yep, they'll likely flock him cross eyed. . .
Sorry, couldn't resist.
I'll let you in on a little secret; Luna is lining up Padma because she see's a very small probability that both she and Hermione will survive the final confrontation with Riddle and his Death Nibblers.
She wants to make sure her wizard is cared for in a manner to which he is becoming accustomed. . .
N!
P.S.
As far as making Ron Filch's assistant?
What do you have against Argus Filch, what did he ever do to you?