I want to use regular snow tires on my Odyssey Touring.  My
understanding is that if I use the appropriate sized steel wheels with
the Honda OE pressure monitoring system and the same size tires as the
Odyssey EX-L (235x65x16) that there will not be any incompatibility
issues.

I realize that I will lose the run-flat capability of the PAX system
but are there any other issues?  Like mounting?  As far as I can tell
the suspension including the hub is exactly the same on the Touring
and EX-L.  The only differences are the shocks and springs have
different part numbers.

Honda NA says they don't "recommend it" and will refuse to tell me if
I can mount the other wheel (their refusal says that I can - in my
opinion.  If they had a real reason they would state it.)  Michelin
claims that I will void my vehicle warranty by doing so.

My local dealership thinks that it is possible but they have never
done this yet and they said there is NO warranty issues because I am
not "modifying" the car.

Some might say the Touring model was "tuned" for the PAX tire system -
maybe so.  But for 3.5 months I think it's better to have the snow
tires than perfect tuning.