I know you specifically said you were looking for a dual 18650 mod, but maybe a single 21700 would be a better option for you because of your small hands.
The Hugo Vapor Urus is a (fairly) small box mod (82x49.5x26mm) that is made from lightweight nylon and aluminium (basically 2 inches wide x 1 inch thick) - all the edges are rounded so there is nothing sharp to dig into your hand so it should be comfortable. If it's too big to wrap your hand around to finger or thumb fire then it should be comfortable to hold between your fingers and thumb because of the light weight - it will be nothing like your Vaporesso Luxe to carry around because that is made from cast metal and is a bit of a brick. It comes in a bright purple, yellow or red (looks pinkish to me but that may be my computer screen) and sells for around £25. Apparently the TC isn't very good but it should be fine for wattage vaping.
There are a quite a few of single 21700 mods that will be easier for you to carry around but I don't know of any others available in bright colours.