I don't know why this didn't occur to me sooner. I've been trying to PLAY fingered glisses. With Stradivari you can smoothly slide one finger up the keyboard (Liberace style) and with practice you can get better results. This is for when you need Diatonic of course. Transpose the Keyboard if you need all white keys.
Problem to watch for:
If the notes are tool close together with too low of a velocity you will get dropouts. I think Strad is maybe trying to play a full portamento and there isn't enough time. Raising the Velocity and/or spreading the notes out a little always fixes it.