As you mention in your first post, slice-chains are the way to pull this off with the OT.

If you start with a prerecorded sample of silence, filling your slice-chain with samples is easy as copy-paste. Just think of creating the slice-chain for a track as the OT’s method of assigning a sample to a trigger for each track. Changing up a sample is as easy as deleting the one out of the chain and pasting the new one in. I leave chunks of silence between samples if I plan on changing out samples in the chain and set the slice points manually.

The functionality you seek is there.