No. The adverbial accusative limits the scope of the verb or equation implicit in ἐξ ὧν, not ὁ Χριστὸς.If it is modifying ἐξ ὧν, it is also modifying ὁ Χριστὸς (grammatically speaking), because the verb is equative.
Yes, ὁ Χριστὸς can be modified attributively by a participle in spite of the presence of an adverb.This means you cannot continue with ὁ Χριστὸς in any other grammatical sense than how it is appears in its clause. ὁ Χριστὸς is bound by and into its clause.
"Limitation" means that the adverbial preposition limits the scope of the verbal action/equation implicit in ἐξ ὧν. It doesn't force an end to the sentence. Acts 2:30, case in point.The addition of the art. strongly emphasizes the limitation. ὁ Χριστὸς is bound by the limitation, grammatically speaking. The limitation predominates.
None of these excuses will get you anywhere. The issue is whether you emend the punctuation with a period, which the manuscripts don't support.
Your argument is unsound, I have no idea where you are getting all of this.