It comes down to what you mean by "create".
When an actor improvises, he doesn't invent words, he strings together words that he already knows to come up with new phrases. If it fits the music, sticking with the example that I gave, you might play
Debbie Boone
Pat Boone
Pat Boone
Debbie Boone
...over a selection of drum kit elements that works.
Just because the fill consists of patterns that you may know an already use doesn't mean that it isn't improvised.
The point I was trying to get at is that inserting pre-practiced fills and patterns will only get you so far and quickly start to look like a limitation even if you sort of vary it with different combinations on those fills. You want to keep yourself open to anything that might inspire you and pulling from the bag of tricks keeps you thinking about that bag of tricks. Really all I'm saying is that in your example above, I think of individual notes as "words" and you're talking about using whole pre-practiced patterns as your words. That's the potential limitation I'm implying.
Using word syllables as guides is a great way to practice new patterns and get techniques under your belt, but the end goal should be honing your overall abilities at translating the rhythms in the music around you into literal complimentary fills. Don't think about how many boones you can fit into a space and in what combination, think about/react what's playing around you in a completely open mind-set. That's real improv. That's where the new ideas come from.
For me and lots of musicians I know... When some new player we encounter is pulling from a "bag of tricks" it becomes painfully obvious once we run through a few songs and you hear the recycling of the same patterns. To be honest, it's something we all do, even other instrument players... It's hard to resist putting what we practice to direct use... But being able to resist doing so is a great skill to have.
Again, none of this is directed at you and you're the second most awesome James around here. I'm pontificating on the general concept. I've also had several teachers use the word-syllable idea when breaking down fills so it's not an invalid idea or anything, I just think it should be for learning rather than use in live musical situations... It's like counting. After a certain point, we shouldn't need to count as we play to stay in place and time, we do it when we practice because it helps us break down the fill/section/beat into chunks that are easy to understand and replicate in relation to the time.
The same often goes for "rudiments". In a normal music/rock setting, you don't want to just be verbatim regurgitating rudiments in different combinations to try and make them sound different. You want to practice those rudiments to help your body and mind be able to execute whatever pattern you might come up with or be inspired for.