Congratulations! Sounds like a very worthy endeavor.
My one flight in a Hawker Siddeley Trident 1C was in September 1971, flying from Heathrow to Schiphol, a distance of 200 nautical miles. I recall ducking my head to enter the forward cabin short oval hatch which had a duct-taped foam pad temporarily affixed to its curved top by a flight attendant to protect boarding passengers from an inadvertent head-strike. (My first clue this was a different aircraft than our Boeing 727, which was a similar tri-jet with three rear engines, and suggested design reference to the lessons learned from their Comet Series 1 crashes). I also recall the netting on the open overhead seat bins-no closed compartments above for carry-on luggage, etc.
The trip took 45 minutes as we orbited about the North Sea, in order to serve/sell drinks and snacks to everyone before arrival. In this regard, not too different from American short jet commutes. I believe the Trident seemed noisier than the 727, (turbojets vs. turbofans) and I was seated well forward in the all-tourist seating. Can't recall the airline-It was not British Airways. possibly B.E.A.?
Good luck on your venture.