Always use official dock and charger!!.
Nintendo power delivery standard is not exactly on par with most chargers and battery packs. some 3rd party docks like the Nyko dock reported to fry the Power IC chip causing brick.
Some users find no issue with 3rd party chargers and docks, but some get bricked.
Not heard of a issue with official bricking due to official charger or dock.
as for joycons,
go ahead the power is so low in them anyway, just dont cross pin 4 on the joycon rail with ground as that pin 4 is 5v live..
I would be worried about the joystick quality and battery and signal range if using or buy 3rd party joycon. The official joycons are crap, the drifting issue they have is ridiculous,
Hence why i bought the 8bitdo switch adapter and use the xbox one controller, or sometimes the ps4 controller, some games require joy con only so thats when they will be used as little as possible so no realy bad drifting of joycon..
But please buy official charger there not expensive if you know were to look.
Grab the official dock also..
And if any usbc cables make sure they have 56k ohm resistor.
Good luck.
Hope this helped.
Switch with dock and charger >
CLICK ME
Dock and charger only fairly priced >
CLICK ME
Another bundle of dock and charger >
CLICK ME