I think you really should put the effort into lacing the old and new floors together. End result will be much more esthetically pleasing. But dont try to start on a distant wall and hope the new floor boards line up when you get to the opening. Aint gonna happen; for a variety of reasons. Cut your staggers using a Fein saw, or remove to the first joint in each row of the existing floor (better). Strike a line from first full board in opening, across the new space, check for parallel to the opposite walls and cheat a little if you have to, but you dont want a bend in the line of the floor, this would be highly visible along the eased edge of the floor boards. Blind nail through the tongue of each accessible board in this patch area, use urethane adhesive where not possible. You dont want excessive face nails in an open area such as this. Use a spline in the groove side of the first line, and work towards the two parallel walls of the new space.
Point of curiosity, my dad used to call this invisible weaving back in his day, lol.
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