You don't need to go to that trouble.
You can splice in an external electronic flasher relay into two wires that go from the vehicle harness side to the LCM receptacle.

The writeup:
https://www.crownvic.net/drock96marquis/LCMflasherbypass.htm
_________________________
"Gassy Grandma" (has dual fuel gas/LPG): '02 Mercury Grand Marquis LS HPP, Silver Frost: runs, drives and currently with mods in progress (headlight relay and wiring upgrade, H1 projector headlights, Bilsteins B6 all around, Arnott HD air springs in the rear, CHE Performance stiff tube rear control arms and Watts link)

'16 Challenger SXT Plus, V6, White like Kowalski's Vanishing Point. Because why daily a Euro car in Europe?

'15 Volvo V40 D5 Ocean Race trim coal smoker (least favorite but hella fast DD - former street appearance police car from La Spezia, Italy).

"You obviously have not been introduced to the ASTM Guidance for Profanity Gauging of Technical Services, Addendum#1, American English to Polish Scale Conversion, by which a repair done at a rate of 35 kurwas per 5 minutes means normal performance."