I currently have a full bar of controls on matchmaker clamps. I want to change some components round. (I am going 1×10 from 2×10, and also swapping to Shimano brakes) 

Can someone shed some light as to if there is a suitable matchmaker type clamp which allows this or do I need to buy separate clamps? 

I currently have: 

Left hand matchmaker
X9 10sp shifter
reverb stealth remote
Elixr 3

Right hand matchmaker
X9 10sp shifter
Elixr 3

 I want: 

Left hand
SHIMANO XT M785
(no shifter) 
reverb stealth remote

Right hand
SHIMANO XT M785X9
10 sp X9 shifter
  

Problem solver for you right hand setup, can’t help with the reverb lever as I’ve never seen one (possibly the problem solver again)

You can run a problem solver on the right but you won’t need one on the left, if you run a RH Reverb upside down under the bars it marries in perfectly with the M785 brake (brake clamp closest to grip, Reverb inboard of it).

I had an M785 brake and XTR M980 shifter ran with an Ispec mount on the right recently but have gone back to a regular clamp as I couldn’t get the positioning of the shifter just right for me