To be serious for a moment (bear with me...), I still cannot see how this can work properly.
The seal needs to be driven down - squarely - quite a long way into the hub casting, according to the factory instructions. If you are relying on the spindle/strut casting to push the seal into the hub, then what is actually pushing it in and how far will it actually go in?
It seems to me that you'll be left with a hub seal that has not been driven in far enough (and can therefore 'cock' a little) and it may well come into rotational contact with whatever part of the static assembly was being relied upon to drive it in (?) when the car is in use.
Seal failure/early bearing failure seems likely.