neither have I and ive been doing this route 3-4 times a year for the last 21 years on different entry visas. Something has changed I think as at check in they where checking everyone in front of me.
Look into the DTV, ask your employer if they will provide a letter stating that some of your work can be done remotely ( even if it’s just online meetings/calls.
This happened to my mate but the passport was declined at Manchester airport on his way to Thailand, had to rebook flights and get a new passport, he had flown with it like that numerous times with no issues, it only takes one official to say it’s no good.
I don’t have a template, but it was just a headed letter with the the embassy address in the corner stating that my position as a site project manager involves site visits and remote working, then signed by the company director