Marek, I had a "middle of the night thought". When you gt old these become common
My friend Derek who has the Blower Bentley, and now another CK Vale, is another of the electric car boffins. For the Bentley he converted from petrol power to electric for a "proof of concept", the Vale is totally electric.
Where he was clever is that he made a self contained module that could be swapped in and out quickly so that he had both electric and petrol with him at the last Tieton I went to. The base plate for both motors picked up on the same mounting points. All he had to do was undo the 4 mounting bolts of the late, disconnect the wiring and slack the chain to lift it out. The base plate ran in some carefully aligned guides so that it was always aligned for the chain run, and being larger than the base of the electric motor getting at those awkward motor bolts wasn't an issue as he never touched them after mounting it to the base plate. Mike Thorpe did much the same when he and Brian used the Mercedes at Tieton and swapped for various events, electric to gas. They had it down to 20 minutes total.
When we had the first builder's meet at my house I suggested this, and Steve Cole picked up on the guide idea, I'm sure it takes more effort to get them right, but you only have to do it once rather than every time you take the motor out.
Why am I suggesting this? Well at the virtual meeting you said you hadn't decided on a drive system Yes I did hear part of the reason. If you did as these guys have already shown is a workable system, you could have your car mobile while you figure the electrics, it would be a real shame for it to sit idle while you sort the electrics, and that is not something I would want for you. If you really wanted I have a spare genuine Honda you could borrow to get it mobile. No TAV though.
