How to setup multi DNS server resolution

I have a peculiar situation which I think may be applicable to others. I take my Macbook Pro to work. At work I have a Ethernet based LAN connection and a wireless connection.
The ethernet connection gets me access to company servers, but uses some crude proxies and limits what I can access on the net.
The wireless was setup by a tech to get around this and has a direct connection to the net, but no access to the company servers.
The best situation I have currently is to put the wireless connection first in the network setting sand use that unless I need a company server. Then I have to turn wireless off before accessing the server and turn it back on to access anything I cannot get through the company LAN.
I've been looking into configuring the Mac to enable me to have both on all the time. I've found that if I execute
route add 161.117.0.0/16 -inteface en0
Then any company server name I have already resolved will correctly route out through the eithernet rather than the wireless which solves the first part of the puzzle.
I've also tried to setup multiple DNS resolution by adding a /etc/resolvers/company.com.au file with the contents:
nameserver 161.117.219.153
nameserver 161.117.248.113
search company.com.au
search_order 1
I've then checked this with scutil --dns which shows
DNS configuration
resolver #1
  search domain[0] : Wireless
  nameserver[0] : 10.0.0.138
resolver #9
  domain   : company.com.au
  search domain[0] : company.com.au
  nameserver[0] : 161.117.219.153
  nameserver[1] : 161.117.248.113
  order    : 1
DNS configuration (for scoped queries)
resolver #1
  search domain[0] : Wireless
  nameserver[0] : 10.0.0.138
  if_index : 5 (en1)
  flags    : Scoped
resolver #2
  search domain[0] : company.com.au
  nameserver[0] : 161.117.219.153
  nameserver[1] : 161.117.248.113
  if_index : 4 (en0)
  flags    : Scoped
But I still cannot get DNS resolution working for the company servers. Dig is no help because it's doco says that it only uses the /etc/resolv.conf file. Unfortunately documentation on setting up multi DNS resolution is practically nil and I've not been able to find any examples on the net. Just a few postings saying to use /etc/resolvers and very little doco in man pages.
Has anyone else managed to get this working?

Following blogposts will get you started:
Automatic Provisioning of a Virtual BizTalk Environment
http://blog.codit.eu/post/2013/06/07/Windows-Azure-IaaS-%E2%80%93-Automatic-provisioning-of-a-virtual-BizTalk-environment.aspx
One Click BizTalk Multi Server Environment Azure Provisioning
http://blog.brauwers.nl/2013/07/23/one-click-biztalk-multi-server-environment-azure-provisioning-and-full-configuration/
Build an Azure IAAS Biztalk Single Server or Domain
http://www.biztalkgurus.com/biztalk_server/biztalk_blogs/b/biztalk/archive/2014/06/12/build-an-azure-iaas-biztalk-single-server-or-domain-win-100-or-other-great-prizes.aspx
Glenn Colpaert - MCTS BizTalk Server - Blog : http://blog.codit.eu

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