Angel and Iceman can still appear in the first class movies, involves a little bit of maths and a little of mis-direction but you can have them in it...
Firstly the x-men, the original 5 x-men were never the same age to begin with Beast was always the eldest, followed by Jean and Scott who were a few years younger, then Angel, finally the youngest Iceman who had to be about 10 years different from Beast...
Knowing that in mind, lets say if in the comics Iceman was 14/15 - Angel would of been 17, Cyclops 19, Jean 21, and Beast 23/24 - So the first thing we can take out of this is the first class of x-men was not characters of the same age.
Secondly - using my calculations and putting them into actions the x-men in the movie universe have totally unrealist years ages... see if we were to say how old would each of those five characters would of been if we saw them today, they would be (and this is information taken from a mix of info we got from the movies and info we got from the actors/actresses age)
Iceman - 31, Angel - 30, Cyclops - 37 , Jean -45 , Beast - 55
So as you can see the ages are a little messed up. Jean is way WAY older than Cyclops. So we cant really go by those ages. Or can we?
Say we set the movie in 1992? odd year i know but for sentlemental reasons its the year the x-men animated series started.
So in 1992 if this is the year we watch X-Men First Class from...
there ages would of been.
Iceman - 13, Angel -12, Cyclops -19, Jean - 27 and Beast - 37
Thats not actually that bad, we could work on this...
In the movies Angel's age was never given only that you know that a few years ago angels wings started to appear which we work out as being his teens and if we take Ben Fosters real age it sort of worked out the same that his character was 9 when it started to happen. Which is wrong because the mutant x-gene is supposed to hit when puberty starts so you cant really classify how old Angel was because the dates dont match up... for which we call - Continutiy error... But that maybe a good thing because that means we can then make Angel seem older than iceman by 2, 3 years..
So reveiw Iceman 13, lets say Angel 16. Cyclops is 19,
so we come to Jean, who is 27 by that year. now i think we could shave off 3/2 years off her age making her 25, seems more likely that she was at that school and the gap between her and cyclops doesnt seem so big...
Beast is the biggest problem, as he techiquelly would be 37, so what i figure with him is that we simply explain he knew xavier before xavier started the school, and Xavier sort of inspired beast to do better which lead to xavier himself thinking maybe i should start a school. and Beast became an associate being to old to be at the school as a student but maybe as one of his first teachers and a member of the x-men...
So with that age thing kind of sorted the second question really is how do we explain a younger iceman and angel at the school...
Well its never been fully explained how long Iceman has been at the school and judging the first movie he has been there a while so that wouldnt be too impossible.
and as for Angel, - his many many lines to the x-men was "I heard this was a safe place for mutants" to which Beast said "Not anymore" or i forget who said that...
But my point being is, Angel could of potentially been at the school a long time ago, when he was younger but left to work with his father because like stryker, worthington crn hoped his son would be cured, stryker took other methods where as angels father worked on an actual cure.
So you could explain that Angel had a short role within the first x-men team.
Heres my idea,
we have the original 5, and they go on there first mission which becomes highly dangerous and xavier realises this, after Angel nearly looses his life, he leaves to go back to his father. Xavier then prevents a young iceman from the team until he is old enough to join his fellow team mates out on the field again.
instead we add Storm and Banshee who are around Cyclops age and become two new members, and our story is told through there eyes in the first year at school