ASK doesn't have built-in trackpad. Instead of buying an ASK, I use just the keyboard/trackpad portion of the Logitech Combo Touch paired with my ESR SmartCase clone if I need to bring it somewhere (to be used on a table or other stable flat surface).
I think there were a couple features introduced in the Apple Pencil 2 but since I just use my Pencil for note taking, I've never really paid attention. I'm using an Apple Pencil clone (based on Logitech Crayon technology). These work just as well as the original AP1 for note taking and bonus is you can use the clones on any 2018 iPad or newer so if you get an Air 4 or something, you can still reuse it.