Making Tuplets with irregular quantities

I'm still using MuseScore 3, as my laptop has proven buggy using 4.

I'm looking to make a sextuplet over the length of five sixteenth notes, effectively a 6:5 tuplet, because I am a composer of torturous methods. Usually, I'd condense the rests into one and use Cmd+6 -- however, I can't condense five sixteenth notes into the length of one rest. Selecting two rests (eighth and dotted eighth) doesn't work, either, as the Cmd shortcut puts a tuplet on both rests. Add > Tuplets > Other... doesn't help, either.

Any ideas?