Question regarding tuplets

I have a piano piece that I am arranging that has a piano roll between two notes. My use of MuseScore is pretty playback-driven, so I need to be able to hear it. But since my tempo is very fast, I realized that the glissando probably wasn't the thing I wanted to use. So I tried to create an invisible tuplet behind the glissandi, and I got myself into a huge mess. Look at the picture down below for a visual. I want a roll in the major scale of the piece, with equal length for every note except for the ending dotted eighth note. I know this is a ridiculous and not super practical request, but I would love some help on this random project of mine.