Your contemplated design is essentially just Bitcoin-NG in disguise.
I'm cannot see a big similarity between Bitcoin-NG and the concept of using a meta blockchain system.
The similarity is as I wrote in my prior post, that you essentially must use PoW to obtain the randomness of whom to select as the delegate to order the transactions in next block.
When you get to a high level of understanding, the taxonomy of generative essence possibilities becomes narrowed and designs that seem differentiated share the same category.
Essence of Genius
The essence of genius is to know what to overlook William James. To solve a problem or explain a phenomenon, analytical genius untangles the relevant from the irrelevant factors. Genius extricates the generative essence to the smallest set of fundamental factors from which the other factors derive. Genius is less dependent on extensive memory (although this aids in the search of possibilities) and more so on the ability to conjure a mental model.
Creativity derives from this ability to extricate the independent factors those that are not redundant because they don't derive from or to those preexisting, i.e. divergent thinking.