Sorry for late response, only notice you right now. For me, idle power draw is about 30w (60w if mem clock bagged out on high clock) on card. It’s worse than it should be (without memclock bug it’s about ~17w), but doable. If you have higher power draw, probably smth else broke.
Have in mind, that custom ROM may not appear at all. My Redmi K30 Ultra is an awesome phone, without ugly dot in the screen, but unlike it’s global counterpart “K30 Pro”, my “china only” phone have different cpu and no other ROM’s for it cause of that. China only also means, that this phone do not have NFC support for gpay (only huawei wallet and some weird china\russian software for some reason) and no gapps installed (like, at all, even tho playmarket will work after manual install). Also, 1/3 of OS is not translated at all, even tho english one of the few languages that supported even on china only rom. Also, you need root to “spoof” your phone ID otherwise some banking soft may not acknowledge this phone (altho, this is very unlikely). Another problem, that all xiaomi phones require you to use official app for windows with connected xiaomi account, then wait for ~2 weeks and only then unlock your bootloader (and for anything bootloader related, like installing different recovery, gaining root or install different ROM).