Just to give a brief about what we are trying to achieve here.
We are creating an AEM based website with various configurable components. I would add a Pega Web Mash Up on AEM website into a placeholder component area (using HTML Pega Mash up code appended in AEM website code) . This Web Mash up iframe would show specific Pega specific gadgets in AEM website and then once I would click inside this gadget, there will be a REST call made to pega real time containers internally to extract decisioning offers and shown to the user as part of Adobe Website. Do you see any infeasibility ?