I am planning on hardwiring a Dashcam into my R59S, but I am also getting my windshield replaced.

The R59 doesn't appear to have side curtain airbags so there are no airbags in the A pillars.

So with the windshield removed I should be able to run my cable "under" the interior panels without having to remove them first; if there is a clear path from the lower right windshield corner to the fuse box.

Anyone know if this is possible, without having to take everything apart (once the windshield is removed)?

 

Should be , Yes, there are no A pillar airbags. You will have to get below the dash and try going through one of the plugged holes near the cabin filter into the battery box location under the windshield cowl.