Because of time restraints that I'm facing, I've come up with the least complex and cheapest strategy I can think of. 😈
--------------During prep---------------
I caste my triple shield as always. [DS #32] Five minutes.
I conjure the EOA. Few seconds.
I absorb into iron form. Instant.
I create my illusions, 10 of them. Few seconds. ST #123 (Against Loki), ST #130-131, DS #70.
I conjure my Astral Ring. (The Ancient One gave Doc a ring which allows him to do everything in astral form that he can in real-life form) [ST #117]. Few seconds, nearly instant.
I conjure the Crimson bands of Cyttorak, not to use as bands, but as a large imprisoning crystal as shown in [ST #128] which covers my body as a protection device.
I rise from the crystal through Astral form, casting a spell of invisibility over my covered body.
My illusions are programmed to attack.
I'm ready to go.
----------------Fight---------------------
Pretty cut-n-dry here, Khell's guy is no mystic, definatly not high enough of one too see the astral Strange and none of his powers nor anything will harm Strange while in said Astral form. There is no kenetic energy being used by me while in Astral form, Khell won't be getting a charge up from my movement.
My body is as protected as one's body can possibly be, iron body, shields three times more powerful than normal(normal shield took blasts from Galactus, Death, Watcher destroying attacks), potentially unbreakable crystal around me and a cloak of invisibility to top it all off.
Khell's guy, a basic Superman clone will have no possible idea where my body is, nor will he be able to see my Astral form. He will see my illusions and attack, there isn't a reason for him to do otherwise.
This is what will happen while he's playing with my illusions(who all have a mid-level telepathic ability [ST #131].).
Strange in Astral form first attacks Blackstroms mind, a spell of forgetfulness is my first act[ST #129].
This first spell will slowly start confusing BS, he'll soon forget just exactly what he's doing.
But before that happens, Strange attacks his mind again with Images of Ikonn [Fantastic Four #243], which will make BS mentally feel the pain of everyone he's slain(He doesn't have to be evil for this to work....just a killer, and we know Majestic does kill).
BS will no doubt be very mentally weak, so it's time to take out the body.
BS will soon find himself attacked by the invisible Demons of Denak which use their claws to attack and their numbers to overwhelm.
BS will no doubt now try and fight these Demons, good.
His mind is utterly confused by this time, two massive mental spells have turned him into a lumbering strong man. As he drifts in and out of concentration on just exactly what he is here for, he finds himself being pulled in all directions by a mass of long, green, writhing snake-like tentacles(Vipers of Valtorr)[DS #34] [DS .#1].
Finally, to put him out for good I undo my spell of the Crimson Crystal, inturn, using it as their major use, bands.
They appear around BS and envelope him, containing him.
To stop any struggle(by now, he wouldn't have a reason to struggle, he doesn't know wtf is going on anymore, he's now as smart as fried pickles) and for the win I return quickly to normal form and conjure the sleeping spell of Morpheus, they have worked on Odin, they would work here.
Incapacitation is a win.
This is very cut and dry, Strange is immune to anything physical while he is in astral form, he also can do basically anything he can do normally, he even can use his eye.
I'm effectively immune to everything.
(don't hate me for such cheap ass tactics, I really don't have much time here to debate....fiance is in the hospitol.🙁)