I've found TriggerCMD to be the best solution for running a home theatre pc from Google Home, as I've been able to write some console commands to control the old TV when it is triggered. It's been working well so far.
My problem is that I have started setting up Google Home for multiple accounts (myself, my wife and son) which has required me to create an individual google account for each of us.
The major linked accounts (eg Netflix, Youtube etc ) use the default unless otherwise specified, but unfortunately google and TCMD will only allow for one account to be linked at a time so my family can no longer control the TV on Google Home. If I try to link another account, the first is un-linked and can no longer use TCMD.
I see three possibilities but you may be able to see more:
1> Go back to 1 account on Home (and loose the multiple users)
2> Allow more than one google account access to the same TCMD account (I can understand you not liking this as it could be misused). This could be aliases or shared.
3> Allow the default google account on Google Home to share the same TCMD linked account (I don't even know if this is configurable except that it is done with the music services)
Many thanks for a useful app,