I do think glass/water setup with underdog could suffice, I do need to rip mine through water to kill the stem fast.
I would highly look into the Lotus or get a stem for your Hammer. Those are both portable and have a quick heat up time. I can use my Lotus and vape a whole bowl in like 30 sec....I'm riding the line of combustion though lol, I worry about burning. You can use low heat too for more taste, just not my MO when I'm using the Lotus. Or the Firefly, but I think I would recommend the previous two more for the "one hitter quitter" types. I liked my Firefly a lot, but I sold it because I had better vapes IMO for every niche. (Lotus/Underdog for on demand "smaller" bowls, Vapman/Mighty for portability) don't want to sound like I'm bashing it, it truly was great, just I personally didn't have a need for it in my arsenal.
Should mention I'd recommend ripping the Hammer or Lotus through water too if you want that "one big hit" effect easier. Idk if I could do it without water but idk cause I only have the Lotus WPA :/