Dangling or not
Solution 1:
"Speaking of which," is a set phrase and an interjection or interpolated remark. It is not a dangling modifier.
It has the meaning of "with regard to or in relation to what has just been mentioned,"
"Speaking of which," is a set phrase and an interjection or interpolated remark. It is not a dangling modifier.
It has the meaning of "with regard to or in relation to what has just been mentioned,"