I know what you wan't to do. I'm telling you what you can do, do get a similar result.
I told you that in my first post.
Why don't you just try things out? To me it sounds like you still even have tried to save a project and to access an instrument.
In reality you can create a project that only have one drum you make, and then save that project. In that case it will be like saving an individual instrument, that you can access like i have described.
I think this is mostly about you learning, and to find out a method that's best for you.
If you look at 7:50 in this video
https://www.youtube.com/embed/gqp0toNX4-M that's the first tutorial in the link i posted, then you can see how your individual instruments will be availble in the Studio view.
At 14:18 you can see how the instruments will be availble in INSTRUMENT view.
What's wrong with that. This way you don't have to save all your individual instruments one by one, that many would complain about, if they had to do that.
EDIT: BTW: If you wan't to save a drum sound created in modular in a audio file, then you can record it and save that as a audio file. Then it will be a audio file like any other, that you can use where audio files can be used. But that's not about Spark2, unless you load that audio file later in a Spark2 sampler module.
And you can do like Terrym suggest in the thread you post a link for.
I think it's much about learning. EDIT END