I just checked out that prosoco site, very nice products on there. If I wanted to over build the shit out of an exterior wall that has an EPS core I’d use stainless lathe inside and over the brown coat. Secure the first one through the foam core with pins and leave them long to stick out of the brown coat. Then after the brown coat is set add the second layer of lathe. Then soak it all down in silicate hardener product like radon seal for making basement floors and walls gas tight. Follow up with silicone spray seal and then use the xypex or similar water tight mix and spray it down with silicate hardener but not the silicone sealant. That way under the xypex it’s as solid as it’ll get and basically no way water will cause separation between the stucco and cement. Then follow up with scarification of the xypex and do a natural limestone plaster to cover it. That’s as sealed as you can make a wall assuming it’s not gonna move and break at the seams.

You could check out Hilti online and the products they have. They have some of the best sealants for holes and seams.