I admit, it’s really difficult.
Concerning ime signatures you’re totally right.
Now, how to input the tuplets:
- Invoke the caret, choose eighths (5)
- Invoke the tuplet-popover, enter 3:2 (or 3:2e)➛ You’ll get three eighth-rests under a triplet
- go to the first eighth-rest, choose sixteenth (4), invoke tuplet-popover, enter 3:4 (or 3:4x) ➛ You’ll get three 1/16-rests under a 3:4 bracket.
- go to the last eighth-rest, choose sixteenth (4) agin, invoke the tuplet-popover, enter 1:2 (or 1:2x) ➛ You’ll get one 1/16-rest under a 1:2 bracket.
Now you have a 3:2-bracket in the top layer and two brackets (3:4 and 1:2) in the second layer.
Go to the first 1/16-rest under the 3:4-bracket, choose dotted eighths and enter the note.
Go to the 1/16-rest under the 1:2-bracket, choose 1/16 and enter the note.
Select all, filter tuplets, hide brackets and numbers.
Select both notes you have entered and beam then together.
Many steps. But as I already wrote, you have to do them only once. Afterwards you can copy this rhythm as often as you need.
I hope, that this ist helpful.