[Stick with LR or switch to Capture One?]

I agree with the previous contributors. 
Capture One is complex; another option worth looking at is ON1. The 2021 version is just out and has a trial package and handles Fuji files.

Another option if you wish to retain LR is to use Iridium Transformer as a plug-in to convert the Fuji files.

[Peak Design strap attachment]

Like you, I bought this strap for my X-Pro2. I am assuming that the lugs are similar throughout the X range (I previously owned an X-E2).

I decided that the link was too tight and decided to usehe triangular link plus the faux leather loops. The assembly  works well.

take the loop and pass it through the leather loop. To pass the loop of the Anchor Loop through the triangular hoop and through the second hole in the leather loop. Turn the loop back and over itself and pass the locking ring through. Pull it through and attach the ring to the strap. This protects the camera and the loop.

Hope this helps.