I have some bad news for you about the purity of Evangelion, hey...
I'd say you're pretty safe re. just the text crossover/Eva-coloured TFs thing, though. Text stories and toy recolours are pretty cheap, but a TV series/movie is a bit more expensive. At most there'd be a radio series IMO.
...
Anyway, after some thought I am now all on board for this project. I can just see it now...(Eva spoilers - watch said spoilers in quotes please people)
And seriously, if you haven't seen Evangelion yet don't read the following, and give it a try. It's pretty damn good.
Optimus Prime has been mortally wounded by an Angel. Being a Japanese TF series, only one thing can save him now!
Optimus: Oh no! I've been mortally wounded by an Angel!
Only the hope and laughter of innocent children can save me now!
...
*Optimus dies*
.................................................. .............................................
The valiant (G1, presumably cartoon-based) Autobots are courageously firing away at the 3rd Angel. An assortment of UN Generals are watching from NERV HQ.
UN General #1: Their weapons are having no effect!
UN General #2: Well, it's not like they're actually hitting it...those Autobots sure have terrible aim.
.................................................. .......................
3rd Impact is beginning a la End of Evangelion. Just as Shinji is starting to go nuts, a deep, compassionate voice can be heard Obi-Wan Kenobi A New Hope-style...
Optimus: Hold onto your dreams, Shinji. The future is built on dreams.
Shinji: ... Thanks, Optimus!
...
Shinji: I hate myself and wish everyone would just die.
*Second Impact occurs, everyone dies.*
Etc. Etc.