I've listened to all his records, and love his music dearly. What else will I like?
Honestly, I would either go with Scott 4 or Bish Bosch.
david sylvian's stuff, especially pic related, is kind of like the missing like between scott 1-4 & climate of hunter
One person whose music reminds me of avant-garde Scott is Thighpaulsandra.
I mean that's what happens when a group that was supposedly going to rival The Beatles breaks up. Plus Scott went increasingly experimental and secluded himself from the public eye.
Also I totally rec watching the 30 Century Man documentary about him. I think it is all on YouTube.
If you're European, particularly British, there's more of an older base of Walker Brothers fans.
They were part of the reverse British invasion, so you don't hear them talked about a lot in America. I did hear The Sun Ain't Gonna Shine Anymore on relatively mainstream radio not too long ago.