after being gas lit by my dealer and also not having time to lose the car for several days (no loaners anymore from west london anymore due to "abuse by customers of loaners"). i fixed myself. very similar. used foam silicon 1.5mm cord...
we also did a mental London > Dieppe > Amsterdam > Paris> Dieppe > London trip last year over 3 days - barely broke a sweat - except our big mistake was the first leg we drove in one go in Oct 25 right through the eye of Storm Benjamin and out the other side. Macan shrugged and did its thing...
i use the newhaven UK <> dieppe fr ferry 6 or 7 times back and forth a year - the alarm does disable for me everytime (after not knowing the first journey where the alarm kept tripping) - its a second click on the remote arm button key fob within 2 secs - all the indicators do a long flash and...
also get "single key to pass" (same key) bars and roofbox and then any other thule product can take the same key when future planning purchases. i have bars roofbox and two bike racks. all key to pass. very handy