Stop in for a cup of coffee

ok......

I'll put it on the coil for now, I'll buy a relay and wire it proper after this weekend
No.
Coil gets reduced voltage.
Put a piggyback on the run circuit before the current goes through the resistor.

What year is your car?
Electric assist for chokes started around '72 or 73. Just use that.
If it doesn't draw much you'll be fine.
and the ammeter will read correctly.