I'm sure I read somewhere that it's not possible.
Say you got to LG+1, then changed race, you would only be able to reach Incarnate (which would be your 10th ascention).
The other thing to consider would be the cost of ascention. If you changed race to an unascended one, would the cost for ascention be the same as your 1st one, or your 7th? (since you were a LG+1 before).
EDIT:
GenLucky DD wrote:If you are a LG +1 (6 ascensions and change your race to an unascended one) when you ascend again it is your 7th ascension and the requirements are also that of your 7th one.
But you also lost all your ascended bonuses in main.
This was dicussed in the ascension forums.
It's not possible
