Appreciate the replies so far. Here’s a pic of what I want to do.

Chop at the yellow hash mark (2) and extend the hard line farther back (3). I considered going with all flexible line, but considering it’s so close to the motor and my foot, a flexible line could melt or get caught/bumped around.
I’m also not sure if that hard brake line is 3/16” with a thick hard coating, because the 3/16” that I bought at the auto store has a smaller OD.
And I considered instead of cutting the hard line, simply removing it entirely, but I’m not sure what kind of joint coupler is up front (1) connecting the hard line to the flexible line.
About the banjo fitting (4), I figured an AN-3 would fit here, so long as I use a metric thread coupler. Bad thinking?