Not a dream but reallity ! Just tried, works really well with crossfader.
Followed above @Hades_of_Spades method with start.
Here is a wavetable I made with SINE / TRI / SAW morphing, with AUDIO-TERM, 128 slices. Crossfader assigned to start, slice mode off, Playback Setup LEN = TIME, LOOP = ON, LEN = 1