Ghost has LA of 5.... Ooh, I get it - you're cheesing in through some sort of ghost template progression levels
Yeah, it works. You're obligated to take the rest of the classes at some point, but that can be betveen levels 89-92, f'r ex.
It's... sorta pointless, though.
I mean, sure, you could take levels in factotum or warblade, but you could get in with just Wiz 7 instead of Ghost 2/X 5.
....Hee, Factotum might be a nice entry, come to think of it - MotUH abilities and extra standard actions.
You aren't required to finish out the progression. That's explicitly stated on that page. Just take those two levels and never look back (or do, as the next two aren't bad either, but only the first two are really necessary for this).
And you CAN'T get in with Wizard 7. That only gets you 4th level spells and Telekinesis is 5th level.