On my last trip (is Vietnam tropical enough for you?) I took an M6 with EF-S 10-22mm, EF-M 22mm, EF 40mm pancake, EF-M 18-55mm, and adapter for EF and EF-S lenses.
My original plan was to take the EF-M 11-22mm, but the EF-S 10-22mm isn't huge, it's faster, and I prefer its image quality to the EF-M 11-22mm - even though the EF-M 11-22mm is a very good lens. I used the EF-S 10-22mm lens for most shots at its widest focal length.
For nighttime shots I used the EF-M 22mm and I also found that I really enjoyed using the EF 40mm pancake during the daytime. Lovely image quality from this lens and it handles well with an adapter on the M6.
When using the adapter and EF or EF-S lenses on the original EOS M there was a lot of hunting as the focus would rack back and forth, but focusing with the adapter works flawlessly and quickly on the dual-pixel M6.
My EF-M 18-55mm didn't get used at all. I bought an EF-M 55-200mm specifically for this trip, but was disappointed with the image quality during testing so left it at home. Looking at sample images of the EF-M 18-150mm, it looks to be similar image quality to the EF-M 55-200mm and it isn't a lens that interests me. It's also quite expensive.
My longest focal length on the trip was 40mm and I really didn't miss having anything longer. Most of my shots were taken with the EF-S 10-22mm at 10mm.
I took a spare battery, but didn't need to change batteries while out shooting. I charged my main battery every night at the hotel and it was enough for the next day's shooting. Nonetheless, it was reassuring to have a spare in my bag, just in case.
I tried Eco Mode on the M6 for a while, but it really started to annoy me as the screen would fade when I was trying to compose a shot. If battery life becomes a real issue I will use it, but I prefer not to. I normally turn the camera off between shots.
My Gitzo GT2541 was too big for travel so I took the plastic tripod that came as a free gift with my EF-M 55-200mm. It did the job, but was really flimsy. I'm now looking at a Sirui T-024 for travel purposes.
dslrdummy, I've had no problems with sharpness using the adapter on my EF and EF-S lenses, but I don't own the two lenses that you mention.
Some sample images here - EXIF info has been retained if you have a suitable EXIF reader add-on in your browser.
http://phil.uk.net/vietnam/hoi-an.html