I have already stated that in the passages Wescott cites, the predicate is figurative, not the subject. As God is the predicate, God would have to be non-nominative & non-vocative and with a preposition to convey the meaning you contend for, just as in Ps 7:10 βοήθειά μου παρὰ τοῦ θεοῦWho says God is “figurative” ?
It’s the “throne” that is figurative. “God is your seat of authority/power/foundation/strength.” Nothing different than “God is your /my rock.”
Unless I see substance next post, this will be my final comment.
Neither is the throne of a human king "figurative" in any sense; and not in this context. A "seat of authority/power/foundation/strength" is the exact meaning of the word "throne." You can't assert the actual meaning of a word to be a figurative sense.
"Throne" can only have figurative meaning when applied to God's throne, or even to Satan's throne, where it is applied to some place on earth.
This implies that it is "God" himself which must be figurative in some sense, to convey "originates from God" which is not even figurative but mere ellipsis of non-superfluous words, which is untenable grammatically (except in the case of the article which is present anyway).