Ah, cubic13 was already there while I took a coffee break.
Well, since I also spent some time with a quick solution, here's another layout example. In this one the monitor button is placed after the solo button.
Changes in rtconfig:
front tcp.mute tcp.solo
tcp.recmon tcp.label...
...
set tcp.recmon h<35 [81 91 26 18 0 0.5 0 0.5] [81 81 26 18 0 0.5 0 0.5] ;[0]
set tcp.label + w<280 [0 0 0 0] [16 0 -16 0] h<35 w<210 [106 91 492 17 0 0.5 1 0.5] w<280 [106 91 479 17 0 0.5 1 0.5] [90 91 482 17 0 0.5 1 0.5] w<210 [106 81 492 17 0 0.5 1 0.5] w<280 [106 81 479 17 0 0.5 1 0.5] [90 81 482 17 0 0.5 1 0.5]
...
If you want to try this one too, edit the rtconfig lines shown above. Or replace the original rtconfig.txt file inside the theme with the already edited version attached in here.