Concise and Unnatural Tuplets

[Waffington]

Hi, I'm having difficulty figuring out how to get finale to notate a rhythm for a piece of mine.
The idea is rather straightforward--I could easily play it for someone and they would have it down instantly--though actually writing it out is proving to be exceptionally tricky when using computer software (e.g. Finale).

What I have is a sextuplet within a quarter-beat in the left hand, and in the right hand I want to fit six notes within the first and last sixteenth of that LH sextuplet. I've added a picture to show what I mean (Note: I've forgotten a sextuplet beam on the first figure in the RH; just know that that first sixteenth rest is actually a sixteenth-triplet rest, which correlates to the Ab below it in the LH). If it's still not clear, imagine the four sixteenth-triplets in the middle of each LH sextuplet to be a normal grouping of four sixteenth notes (not triplets); the RH figure would be a sextuplet within that grouping. So my figure is basically a sextuplet within a sextuplet.

The problem therefore is that I'm not just creating a tuplet, but fitting one into part of another already-existing tuplet (six notes within four sixteenth triplet notes), which I'm not sure Finale has a tool for. Perhaps a plug-in?

If anyone knows how to get this into Finale, please let me know.
I could also just fake the figure, but that's a lot more work and it wouldn't have a proper playback function, so it's all-around a much more annoying process that I'd rather avoid.

Thanks!

[motet]

Like this? I did the RH nested tuplet in Speedy entry by typing Ctrl-6, entering the first 16th, then typing Ctrl-1 and picking six 32nds in the space of four 16ths, entering the six 32nds, then entering the final 16th. I broke the beams and flipped one of the tuplet numbers afterwards.

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[Peter Thomsen]

Another way to “skin the cat”.
This layout might be easier to read.

[OCTO]

If anyone knows how to get this into Finale, please let me know.

Motet has the solution. I would however avoid flagging the hold notes in RH.

[Waffington]

Thanks!

These are great answers.