I have the MytiMug 650 too, I use that mainly with my Honey Stove wood burner. Its a great piece of kit, never tried taking the handles off so far.
Nice cozy by the way, how much longer doea it stay warm ?
Did a video of my Honey Stove on my Youtube channel If anyones interested (shameless plug lol)
https://www.youtube.com/channel/UCqzYf9vdi1VVRtjN4OBMS4A/videos