I had trouble with even $2k quote electricians getting back to me. One of them looked at my panel load and said per calculations he cannot add a 2nd 14-50 in the future(200amp panel) if need to be, so I'd be limited to a single outlet he can add with all of the re-work of panel. That got me thinking in the direction of the dryer buddy, which lets you share 14-30 between the dryer and another outlet that you can use for EV (with extension cord) - for the future expansion.
Once I read up more on that site, I noticed they also have RV buddy/range buddy products that split 14-50 into two outlets.
There are 3 versions of these splitters:
1. Cheapest, just a Y splitter - if you accidentally use both outlets, then breaker in your electrical panel trips. Some people warn of risk of fire, so I probably wouldn't go with this one.
2. Manual switch on the box, so you ensure manually which outlet now gets the power.
3. Auto plus, which automatically detects if "primary" outlet starts drawing power and if so, disconnects the "secondary" outlet at the 3.5amp level. I.e. for a moment you may be drawing 43.5amps, which is ok for 50amp outlet for "under 3 hours", from what I gathered. However, I have a 40amp breaker on my 14-50 outlet, which currently serves 40amp sauna. I have 50amp wire, so no risk of overload, but I think breaker might trip with the auto option.
So, as a short term solution, I bought 75 feet extension cord for 14-50:
https://www.amazon.com/gp/aw/d/B079JBWR6W?psc=1&ref=yo_pop_mb_pd_title
That should get me covered when the car comes in about a week. The cable is pretty thick. I had it attached to the joists of unfinished basement(would be the same thing if an electrician had to feed the wire into garage), drilled a hole into garage and have ~15feet of the cord available in the garage, which I haven't yet decided where to attach.
I think couple of months later before I start using sauna I will buy manual RV buddy for $330
RV Buddy Plus #1 Custom 50A 2-way switcher, 3.5' 14-50 plug cable to two 14-50 outlets, with kWh meter
The pictures are messed up for that item, but you can see the approx picture with the switch here
Upgrade pak from Dryer Buddy™ on order (waiting for build) to Dryer Buddy™ Plus
So, the buddy and extension cord will get me functional for 2 appliances on a single 14-50 outlet w/o the need to unplug/plug in dif. appliances(which is a risk of wear on the outlet - seems they don't last long) for less than $700. Maybe I could replace the breaker from 40amp to 50amp and get the AUTO version of the buddy.
The buddy product seems to make sense; since electricians don't want to add another high power curcuit in the future, I will do the same with the dryer outlet when it's time for another EV and split 14-30 into two 14-30s (few people don't recommend to split 14-30 into 14-30 and 14-50, since EV will think you have 50amp available on the curcuit, which you don't and may overload if your limit set on the car is somehow reset).
So, I think I will have this 40amp option right now from my outlet ~60 feet away from garage and later another 24amp connection I will add the same way, which will be cheaper; My dryer is on 2nd floor, so I'll drop extension cord into the basement and feed into garage through the same hole, will probably be shorter extension cord and thinner - 30amp vs 50amp. This 2nd connection is my only option that electricians won't do for me.
I guess maybe I could split 14-50 inside the garage, so that each EV only gets half the power, but with buddies(RV and dryer) I'll have 2 separate circuits. No electrician needed