electrical - Existing NEMA 10-30R for dryer wired with hot hot

I'd like to change the obsolete unsafe NEMA 10-30R to NEMA 14-30R so that I can safely have a smart splitter switch for dryer and EV charging. Behind the NEMA 10-30R I see 3 wires: black, white (ta

30A 125/250V 10-30R Straight Blade Single Flush Receptacle, 3-Pole, 3-Wire, Power Outlets, Outlets and Receptacles

Trying to swap 4 prong dryer outlet for a 3 prong. I have a black

ENERLITES 30 Amp Dryer Receptacle Outlet, NEMA 14-30R, Residential

NEMA 10-30P Power Cord For EV Charging – SIGNAL+POWER

ELEGRP 30 Amp125V, NEMA 10-30R Surface Mount Power Outlet, Single Straight Blade Range and Dryer Outlet Non-Grounding, Black 2203 - The Home Depot

The Little Green Wire – AC Connectors

How To Install and Use a 30-Amp RV Plug

HOT-1.5FT 3 To 4 Dryer Adapter Cord,N10-30P Male To 14-30R Female,250V 30 Amp 10-AWG Dryer Outlet Plug Power Cord US Plug - AliExpress

AC WORKS 1.5ft NEMA 14-30P to NEMA 10-30R 30-Amp 4-wire To 3-wire

Dryer Adapter Cord 3 Prong to 4 Prong, NEMA 14-30P Male to 10-30R