that is a good base for seed starting.

And it would be good soil for your mix too, as long as you have lots of porous stuff (Turface, granite gravel, pumice, etc) to provide a majority of the mix.

I was under the strict impression this is exactly what I don't want in my mix, no?

What are you planning on growing? In what conditions (clay or plastic pots), indoors or out (these factors all matter)?

They spend their winters inside my south facing sunroom in front of the windows in clay pots at around 55-60' F. In the summer they're outside under a small makeshift greenhouse so I can control their water. I have a variety of succulents and maybe a handful of cactus and orchids.

As has been written here for example, peat is bad, but the second part of that equation is that it's OK if you provide sufficient drainage and are able to manipulate / withstand all of the other variables which influence watering (sun, heat, air circulation, type of pot, location, humidity, what you're growing).

With that stuff and steer manure, along with my granite (poultry grit) and Turface, I can grow Cyphostemmas to mythic proportions (admittedly, Cyphos like a rich mix when in growth).

It's all about the drainage.

You don't have any flower beds? I wouldn't put that in a pot, except maybe a seasonal display I expected to be short-lived anyway, but wouldn't toss it in the back 40 either.