As a general consideration if I couldn't do this to a very high spec I would be much happier direct patching my gear. I'm close to the (highly skilled) designers of two separate commercial console projects and have spent quite a bit of time inside one, getting it right is far from trivial. Crosstalk, THD, to buffer or not, noise....
There are several commercial products out there that I consider to fall well short of the mark too.
Another way of looking at this is to keep it as simple as possible, the less there is in line the better.