Gotcha,
I’d certainly be very uncomfortable putting holes in a beam and see where you’re going with the 4 clamps and a plate to fix to, especially clamps that are designed for vertical installation.
Getting quotes for install is on the table but thought it worthwhile also investigating the viability of a self install (and getting an idea of what can be done when solutions are presented).
I don’t suppose you have any recommendations for rigging installers in the Kent area that I could approach, I feel as though I’m drowning in sponsored search results and prefer a recommendation that I can trust?