Hi all, okay I give up… how do I create this?
It is good that you are not giving up: the easiest and smartest way would be to create a simple triplet with three quavers (or eighth notes), then select the first quaver and press . (or press the 5 a second time). This will turn the first note into a dotted one (Dorico is so smart to change the second note into a semiquaver).
Now just delete the first dotted note - and you will be left with that space, represented by a dotted rest.
Doesn’t work; Dorico converts the dotted eighth to an eighth + sixteenth rest.
There are more steps needed after making it a rest:
select the 8th rest
press the letter O [to force duration]
press the dot (.) [to make it dotted]
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Thanks, that was the missing part! 
Instead of entering a note at the beginning and then deleting it later, you can also:
- Select the eighth note tool and enter triplet mode
- Press 5. to select a dotted eighth
- Press the space bar to advance the caret
- Enter the sixteenth and eighth notes
- Exit note entry and use Force Duration to convert the rest (as @JAMES_GILBERT suggests)
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