Dinghams work well but work best when handed i.e you have to keep all vehicles facing the same way. Can be a problem if you have a reversing loop, a triangle, cassettes or rotating fiddleyard.

Probably the neatest coupling is the Alex Jackson I know Gordon Gavett and the late Martin Brent both used them on exhibition layouts. I have a jig that Martin produced to assit in getting the angles right. You could either retain the three links with the AJs

The other option is to use child labour I found at exhibitions kids could be given the controls and would operate well, their nimble fingers were much better than mine at the three links.