I wish they had these available couple of years ago; I moved all my self-assembled lights to 21700 Hosts because cheap buck and boost drivers were only available in 20mm and 22mm sizes.
To quote myself from a reddit post from a few years back (I just nuked the album in imgur recently, oops!), I modded a DQG AA (not AAA) with a Nichia 219C:
"So, using the very fine tip of my soldering iron I reflowed that son of a bitch in place (yes without removing the single-piece driver/LED board or the retaining collar) using my $17 Amazon iron set to what it claims is 450C (840F) by just heating the exposed nubs on the positive and negative solder pad that stick past the LED package. The middle thermal pad came off the driver board but without any apparent ill effects."
Some LEDs can be heated from the side in this manner, too.
@masterironchef
@lemmy.world