In case it's relevant, the other options to force non-interactive install were 
in /etc/apt/apt.conf
APT::Get::Show-Upgraded "true";
DPkg::Options {"--force-confmiss";"--force-confold"};

We appear to have worked around it by adding

shim-signed     shim/disable_secureboot boolean false
shim-signed     shim/enable_secureboot  boolean true

in the preseed file.

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https://bugs.launchpad.net/bugs/1603642

Title:
  (trusty, debconf passthrough) package shim-signed
  1.17~14.04.1+0.8-0ubuntu2 failed to install/upgrade: subprocess
  installed post-installation script returned error exit status 128

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