This adapter doesn't require any physical alteration of the remote.

DJI RC 1 (The one that come with DJI Mini 3 Pro / non-pro)

You only need:
-2x RP-SMA to IPEX cable (+/- 20cm)
-2x plastic screw #2 x 10mm
-2x Antennas (I used old Asus router antennas)

This extend the range of about +500m in the city with the crappy Asus antenna,
with propers Alfa APA-M25 you can double your range.

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