This is what I call “takes” - basically, record as many times as you’d like, and when you are done you can decide which bits to keep.
The closest thing to this workflow that I know of is implemented by an excellent little tool called Auto Clone Patterns
What is great about it is that you get the ability to just record away, jamming on top of the patterns you decide to loop.
And, as a sideeffect of Renoise being a tracker, it is easy to regard each of the resulting patterns as a “take” and then delete the parts you don’t like.
As for the sorting of notes, low → high, this is something I needed myself. I did a modication of Ledgers Reorder Notes by Pitch tool,
you can find my version here (a bit hacky, you need to install Ledgers tool and then overwrite with my file. Note to self: I really should offer it as a separate tool)