I think there could be a market for this amongst the safety concious who would prefer a twin for regular overwater / montain flying.
I think the problem is that the extra safety of a twin is illusory
in practice in the GA context.
I have just 2 hours ME (against nearly 1k hours SE) but everybody knows there are all kinds of issues with twins. You need a lot of currency for it to be statistically safer, having two "cheap" engines (as in your URL) rather than one big old sturdy one is not necessarily going to be safer at all, there are complex issues with SE performance (not just at low speeds but also stuff like the SE ceiling which becomes pretty relevant over high terrain which is exactly where you may want the spare engine) and finally there is the extra drag which knocks the MPG by best part of a factor of two.
And finally there is the extra training, and the need for regular training because one does have to pass the 2 yearly checkride with a 'failed' engine. But cost is a personal decision! One would just hope to be getting something tangible for that extra money.