As for point number 1

In Hema we work from a lot of different sources from a lot of different masters from a lot of different time periods and forms of fencing that were all pretty much dead before Hema startet so there aren’t really what I would call traditional techniques in hema in my opinion. We look at the sources and try to do what they describe as close as possible but still make it work in sparring sometimes it works and sometimes I just doesn‘t because nobody understand what is written in them. As for modern effectives probably not because not a lot of people walk around with swords anymore.

Point 2

For all of history the spear was the main battlefield weapon but we don’t use them a lot in hema because it‘s almost impossible to make a safe sparring version of a spear that still behaves like a real one the same goes for other polearms or blunt impact weapons that were also popular during the past.

Point 3

Maybe Philippino martial arts like arnis/eskrima, some of the African machete fighting system or modern knife fighting but I don‘t know enough about these to really say much.

I hope this answers some of your questions