By the way, I've managed to tackle this issue in PT/GP:

I've tabbed a 3/4 measure with three eight-note triplets. That left me with 4 notes.
I've put those in a 2/4 measure, NOT as triplets but as regular eights. So the bars are correct.
Then I simply multiplied the actual BPM for this song with 1.5 for this one measure. Thus the speed of the regular eights equals that of the triplets.

Not very clean but it works.

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