Ja, but then we got a problem with these:
1) aetiology
2) aestivate
3) aegis
4) aeon
Those are pronounced like 'eagle'.
But I agree your eh makes sense with aerodrome, aeroplane, aerosol.
So let's see our options:
1) Æson, pronounced eeson
2) Æson, pronounced ason
3) Æson, pronounced ehson
And lastly the wildcard: ayson. (I think that's what the ordinary Joe will think it is.)