What I basically want to do (and therefore not caring about real Channel Names) is the following:

Map This Layout: Center Left center Right center Left Right Left surround Right surround Low-frequency effects
To: 
Center = AE_CH_FC
Left Center = AE_CH_FL
Right Center = AE_CH_FR
Left = AE_CH_SL
Right = AE_CH_SR
Left surround = AE_CH_BL
Right surround = AE_CH_BR
Low frequency effects = AE_CH_LFE

Not cause I like to break or overwrite Channel names, but cause I have never seen a Speaker Layout like this and want to mape what Apple probably had in mind.

Via: https://developer.apple.com/library/mac/documentation/MusicAudio/Reference/CoreAudioDataTypesRef/Reference/reference.html#//apple_ref/doc/c_ref/kAudioChannelLayoutTag_AAC_7_1

I see this as a workaround for formats nobody can play directly, but had the intention to play something on 7.1