This is one of the reasons I gave up on M4l many years ago.
As far as I know using sends is the only way. And if your working in the audio realm, this adds latencies to you signal path.
Can always make a max patch external to live and pipe the midi in the traditional way.
I wish max for live could be able to create things outside of the track structure in live. Like multichannel patches that feed into separate channels for mixing and processing