Welcome! For making your posts easier to read and understand I highly suggest breaking it out in paragraphs. It was a bit difficult to follow.
I don't know of any turbo HR16's in the US. Could you provide links to that vehicle? Also do you have any pics of your manifold?
Goodluck on the turbo charging! I don't see why you can't do it. I think even stock injectors and a way to tune the ECU and you could get a nice bump in power. I am pretty sure there are ways to tune the stock ECU as I have seen companies flashing Versa ECU's right on this forum. I can't remember the name, osirus or uprev or something.