Good job with the project it sounds like!
I’m always around but I don’t always have time or see all things. 
I even manage to miss notifications or glance at them in the middle of the night and forget that I should respond when I wake up, since the alert dismisses itself after I see it. 
I would simply create the audio with the intent that it will be the conduit for the attunement, then after I had created the recording I would channel the attunement into it while it played- on repeat if necessary.
With true physical art or creation of something with my hands I can manage to keep the energies/attunements/purpose all easily front and center and create whatever it is- sometimes even while conversing with others (personal projects and such and family walking up not realizing there’s an energetic side to what I’m doing) but…
Something like reiki/attunements where I’m embedding very specific symbols and purposes is harder than it is when I’m working with energies with specific purposes but no symbols.
So when I’m doing a reiki thing, I do my little doodles- then I connect to reiki, say the words, channel the energy or attunement.
Basically, I think it’s okay to do it in more than one step when and where it makes it’s easier for you.
I think in general that when we are able to get a smooth, easy and steady flow, that the energy has a higher likelihood of flowing smoothly and easily into the end user, as well. If I struggle to get into it, the end result is not as good for the user imop, or the results don’t seem to be as strong, so I shoot for getting into the zone so to speak, where energy and intent and everything simply flows without effort, but because of intent.
Easier than to say than to, but I think you’ll know the mode I mean with all the energy work you do and you’ll understand me and that my thinking of splitting it into two or more parts may allow you to get into this state easier and make the process more effective over all.
Sometimes I start out breaking things down into two or three steps like this so I can flow through the steps easier and find that over time I’m able to compact more steps into one, as I’ve gained experience and practice with both steps so they are easier to combine and do all at once.
Other things it’s quite simply easier to break it down into two or more parts otherwise the result just won’t be as good because of my lack of skill at doing all the different parts in the same moment.
But you do work in mysterious ways 