I wonder what Qui-Gon would think of that ending? Probably “it is the will of the force…” and so at least nominally approve.

And then that leads me to wonder if knowing that, would he still have had the courage to do it - and die as a result, even though obviously becoming a force ghost?

Now that is probably crossing the line into over-thinking it! 😄 (/s btw, bc there is obviously no such thing!)