Thanks for the suggestion Christopher, will give it a go!

Have been doing something similar with 2 chords rather than 3, going back and forth as much as possible during my practice sessions. The chords sound OK, no buzzing, and I can usually get the shapes in one go without having to place each finger. If I could eliminate the gaps between changes, which sometimes can be a few seconds, that would seem like progress to me. My fingers never seem to land in the same place twice and are often slightly off, so have to correct a little before I strum (which always has to be a downstroke because the pick falls out my hand if I try upstrokes!).

I've never been able to play songs in all the years I've been trying so under no illusion this could be a lot more struggle to come!