Rule #1 - Be Patient - Rule #2 - Don't ask when, if you don't contribute - Rule #3 - You have coding skills - LinuxMCE's small brother is available: http://www.agocontrol.com
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You will need to have Asterisk on you Core, but you can copy your config files over and use them directly. I did that once and then I decided to use the LinuxMCE standard way as LinuxMCE keeps a lot of configuration inforation in its databases that it needs to do some of the cooler things. This was a disruiption in service, but it's the best way really.
As for MythTV... I wish... This is actually a big problem for me. It seems LinuxMCE uses an outdated version of MythTV and is incompatible with the newer releases. However, if your backend is the same version then you can use your existing Myth system. Although you should move the database to the Core.
I almost forgot... the Kubuntu thing is being discussed in the Developer forum. I still don't understand it's rational...