Hi Vince,
Unfortunately implementing something like that where you can use server controls in the editor is a very tall order and not likely to happen any time soon if ever.
Thanks very much for your generous donation, it is very appreciated and makes me wish I had an easy answer for you but I do not. You might look at strategies like implementing json service pages and loading things in the html using javascript that calls the json service, that would be one way to dynamically load some other content and make it re-usable in different places.
Best,
Joe