Launching a national coin that is open to everyone globally seems to be a bit weird. You could just use any other cryptocurrency and it's usually easier to use as it's better established.
Your statement is interesting. To us the launch of a coin that is destined to a local community seems logical, so you must have something in mind which we don't see.
Let me tell you first what makes a national coin logic to us. Then we elaborate on your suggestion to use any other more established cryptocurrency instead. From that point we will argue why your own proposal is weird.
Back in 2014 we came to the conclusion that Bitcoin had at least one major flaw: When it would be used as a peer to peer cash system and would have to compete with fiat currency it would become bloated very soon.
Because the use of Bitcoin is permissionless and because you can think of many more applications than just peer to peer payments, the potential problem will be much bigger. When we just focus on worldwide financial transactions it is fair to prepare for ten payments per person daily as an average. If you compare that load to the capacity of Bitcoin alone, that capacity (1 milion transactions/day) is a factor 10000 too small. To give you an impression, in the picture below, the blue surface represents the capacity required and the white dot represents Bitcoin's capacity.
Moreover bitcoin is intended to be decentralised. We do'nt know if you maintain a bitcoin core-wallet but we assure you very few people do, because it is too heavy allready. Increasing the blocksize is a rather short sighted solution with decentralisation in mind. Just listen to what LukeJR jas to say about that:
https://bitcoinmagazine.com/articles/is-it-time-to-take-an-initiative-to-decrease-bitcoins-block-size-seriously/We believe that the adoption of a specific cryptocurrency by a local community is only natural. These local communities do exist you know. 99% of all financial transactions is local. Why disturb this valuable (and expensive) global blockchain when someone in Shanghai wants to buy a pizza? And how do you think a pizza seller in Shanghai will need to value your "just any other cryptocurrency"? There exists thousands of them. We think it would have to be a cryptocurrency he knows. One that is generally accepted in Shanghai. For you that is easy. If you do business in Shanghai on a regular basis you just change some of your Bitcoins to the popular cryptocurrency over there. The pizza seller will tell you which one that is and it would take a few seconds to obtain them with your "any cryptocurrency". In the Netherlands that could well be e-Gulden/EFL. It is open-source, it has Bitcoin in its core, it is decentralised, easy to access, it is easy to use in any HD wallet, it is censorhip resistent and indeed borderless as any cryptocurrency that plays by the Bitcoin rules.
Maybe this will change your mind, but we are very interested if you still think our e-Gulden/EFL is weird.