If the fuse is up front at the magneto (as mine was), it protects everything downstream just as a resistor would.doesn't protect the ignition from a short through the wire. The resistor at the P-lead connection is to safeguard aganist any short incl the wire.
Prices for this kind of stuff is sky rocketing! Shazam!Westach makes one that will fit but depending on your limit it might be in the “break the bank” area for you.
Here’s the one I think you would need *ouch*