That Alloy R9 lever + XG caliper bundle is the one to get in my eyes
L-TWOO carbon shift levers have a history of breaking and the problem isn't localised to the Hydro, even the Rim brifters have been broken before
The problem comes down to the shifting mechanism requiring way too much force to actuate, with that initial shift being the hardest and getting progressively lighter as you multi-shift. I don't think they'll ever meaningfully revise this so just opt for alloy which should hold up better than carbon blades.
As for the derailleurs, now that you can get just the levers it's a no-brainer to use Shimano. 105 derailleurs are pretty cheap and flawless while the L-TWOO units are fundamentally just slightly improved versions of the original R7. Slapping a carbon cage on it is like putting lipstick on a pig in my eyes, sure it'll be lighter but the function will still be the same. I'll also choose 11s R9 over 12s RX because the 11 speeds doesn't require as tight in tolerances to shift well. For 12 speeds to shift nicely you should use R7100 Hyperglide chain and cassette at a minimum.