I’ll have to look again at ‘Day of the Lord’ as different from ‘Day of Wrath’ - but I’m coming with some scepticism about your assertion. The scepticism is fuelled by prophecies such as Joel - quoted by Peter in Acts 2 - which have no anchorage in any particular event, and could just as easily apply to a final judgement as to a judgement which ocurred in history.

Concerning the promise to Abraham, you say:

"What you are really arguing for is the direct personal, current and active participation of the believer in Christ’s death and resurrection. That may or may not be appropriate as a matter of modern theologizing."

My starting point is that ‘the promise’ points to Christ himself, and our active, current participation in his life. There can be no participation in his life without participation in his death and resurrection. That is there in the texts. The only modern theologising taking place is yours when you reinterpret Christ’s death & resurrection as being of direct significance only for 1st century participants in Israel’s history.

‘Life of the age’ - I think you have now presented this in a way which makes sense to me - bearing in mind that ‘life in the Spirit’ is also the life which continues beyond the age into the life to come.