Yes, they are pretty easy to make.
I used this guide to make mine, its in german, but the images show how its done: https://www.paracord.de/paracord-knupftechnik
This one creates kind of a double lanyard since you don't stop after reaching one end. Instead you continue to go back to the start (step 11 and following).
As for the handstrap i'm thiniking about to create a lanyard with some bungee cord i have laying around. This might make it kind of stretchy so that i can use it with or without gloves.