Whether something can be suppressed/cancelled/deleted is something you have to ask on a case-by-case basis, rather than asking whether archetypes can do it in general.
In this case, the choice is tied to the positive/negative channeling, and I can't figure out a way to remove it.
You'll need to create a copy of the Oracle, and set up the spells on the copy so that there are more choices available. Sorry.
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