Mixed environment migration (OCS\Lync 2010 to Lync 2013) retaining BES Integration

Hi All,
I have an existing OCS 2007R2 and Lync 2010 environment which contains BES Collaboration for Enterprise IM on Blackberry devices. I want to migrate this environment to Lync 2013 whilst retaining the BES integration. Understanding that tri-existence is not supported
I've been going through the process of decommissioning all of my legacy OCS servers, which I have now completed, in readiness for starting the Lync 2013 deployment and prepping AD.
Here's my issue - The BES collaboration service was integrating with an old OCS CWA server. I removed the CWA server and migrated the Collaboration service to a new server so that I could configure it to directly communicate directly with the Lync 2010 pool,
however I still needed to install OCS components on the new server in order to achieve that integration. Now I've run the final step of Merging the OCS 2007R2 Topology with the Lync 2010 topology in preparation for deleting the BackCompatSite, the old OCS
servers have gone, but the new Collaboration server has now appeared as a trusted application server within the BackCompatSite. I've done an LDIFDE export of the RTC Service container and have had a look through the contents. I can see that the new BES Collaboration
server is there and that it has an msRTCSIP-TrustedServerVersion value of 4, whereas all the Lync 2010 values are 5, which I'm guessing is what the Lync Topology is using to establish that the BackCompatSite needs to be populated with that Trusted Server entry.
So my question is this - What do I need to do in order to successfully remove the BackCompatSite entry and migrate my environment to Lync 2013 whilst retaining integration with BES and keeping the Enterprise IM service service running on Blackberry devices?
Here's some options that I've thought about - Using ADSIEdit to remove the Trusted Server Application for the new BES Collaboration server so I can merge the Topology and delete the BackCompatSite, although will this break the Enterprise IM service? Temporarily
changing the value of the msRTCSIP-TrustedServerVersion for the Collaboration server from 4 to 5, merging the Topology, deleting the BackCompatSite and then changing the msRTCSIP-TrustedServerVersion back to 4 afterwards? Over a weekend\out of hours, removing
the BES Collaboration server and service altogether, going through the Topology merge\BackCompatSite deletion and then reinstalling the Collaboration service?
Has anyone else gone through this process, or got any advice\experience to pass on before I start working through my list of options?

I've asked this question several times:
Does the 2007 R2 CWA server count as tri-coexistence?
I've asked that both in MCM rotations and directly of people on the PG and the answer is always something along the lines of "nope, it's a trusted app server and not a pool". When I've run into this issue in other deployments, we simply left the backcompatsite
in the deployment into production.
I've never found the above as a publically approved statement just something I've asked previously and been told is OK to do. This is one of those situations that will work but was most likely not tested.
Thanks,
Richard
Richard Brynteson, Lync MVP | http://masteringlync.com | http://lyncvalidator.com

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