I want to make a theme team based on the Midnight Sons. As far as I can gather this is what I can use so far.

FF Ghost Rider (for Johnny Blaze)
LE Daniel Ketch
Blade
Dr. Strange
Nightmare (a sub for Morbius)

Would anyone else have any ideas as to who I can use to sub Midnight Son members who currently don't have a click form?

Well here are the Midnight Sons as I saw them

Johnny Blaze - FF Ghost Rider
Ghost Rider - Daniel Ketch LE
Vengeance - Ult Ghost Rider V
Vengeance wasn't initially part of the team but became part suring the Seige of Darkness
Dr. Strange
Blade
Morbius - I think that Nightmare is much too powerful, and doesn't have the right power set. I would go with either the Baron Blood Unique or the Vampire Batman Unique
Hannibal King - same idea as Morbius.
Frank Drake - I always likes Skull buster. Mostly becasue the sculpt has that big cannon of a gun like Frank used during the Midnight Sons
For the Darkhold Redeemers, just add in any three pogs to be honest. While the main girl from that group, Victoria Montessi, had some supernatural abilities, she would still be a one hit KO. Maybe one of the Police based pogs for Sam Buchanen (Harvey Bullock).

Also there were some background storied under the Midnight Sons label (in Marvel Comics Presents or in Midnight Sons Unlimited) that centered around Man-Thing and Scarlet Witch. Werewolf-By-Night was also in there and a Hyena would work for him.

That's the best I can say at the moment.

I think Sauron would work very well as a sub for Morbius as well.

You're right I never thought of that, but a little bit of Mind Control is very suiting.

Sauron is a perfect call for Morbius. Flight, BCF, SE, and MC are all the key powers I see for him (except Super Senses...)

I think R Electro is a good choice for Frank Drake, actually, since both EE and PB are good representations of his Hellfire gun. Johnny Blaze could also use this dial. Might wanna pop off the fig and glue on Gotham Undercover.

Victoria Montesia was a nurse, so use a medic for her, since it's accurate and should be helpful to your team. R Paramedic, maybe? You could paint the hair black.

Ghost Rider 2099 makes an ok Vengeance / Michael Badilino

V Ghost Rider (Blaze) - 102
LE Daniel Ketch + Swingline - 98
E Ghost Rider 2099 (Vengeance) - 60
E FF Dr. Strange + Protected - 104
V Blade - 41
U Baron Blood (Morbius) - 95

-------500

looks like a pretty solid team to me...i may just steal this idea