I've tried a couple of integrated glove/guard products and I thought they left something to be desired. The glove portion had poor fit and construction, and the wrist guard portion did a mediocre job of bracing (but succeeded in making the device cumbersome). The brace portion was either basically a tight band to squeeze the wrist but didn't restrict motion, or the rigid portion of the bracing uncomfortably poked into my hand.
I've found that the R.E.D. guards are fairly slender and fit pretty well under gloves, yet manage to actually brace the wrist rather than just simply squeezing the wrist.
Wrist Guards - Adult | Burton Snowboards
I haven't tried these but they look slim:
As for gloves, I've found that the best fit is when I use a glove with an ample gauntlet that goes over the sleeve. Once you have the braces on it's a bit tricky to pull the jacket sleeve down over the glove, so the gauntlet lets you grab onto something and yank.