Jumping in here even though my own 725 was on the GMAT Focus, not the EA, since a chunk of this transfers directly. One week is tight but doable if you're ruthless about triage rather than trying to relearn content. Since EA quant and verbal lean heavily on reasoning speed rather than obscure content, I'd spend day one just taking a full diagnostic to see which section is actually costing you points, then spend the rest of the week almost entirely there instead of spreading evenly across all three.
On GMAT questions as a substitute, they work reasonably well for the quant reasoning and DS-style logic, since EA's Integrated Reasoning and Quant sections overlap conceptually with GMAT's, but I wouldn't lean on them for the actual EA-specific question formats since the interface and multi-part questions behave differently. I'd prioritize the official EA practice material first and use GMAT Club's sheets to fill gaps, not the other way around. You've got a week, that's enough time to move the needle if you stay focused on your weakest section instead of trying to cover everything.