It wouldn't be difficult at all to develop a blockchain.info version of nxt. The entire thing could be done with a few servers and PHP.

CFB has made it extraordinarily easy to use PHP commands with the API of NXT.

This basic format could be used for transactions, or anything really.
ArrayID->json_decode(file_get_contents(url));

ArrayID is the response in this case.

If I get some free time I can have something that works online, I have a meeting in a hour, if it goes well I should have the rest of the day off.