Thanks I’ve just had a go with this. It’s a nice effect in it’s own right with all of the weird artefacts it introduces, but not quite accurate enough for what I needed.
No worries 
I think after playing around more today, that I’m actually going to just embrace old school pitching down and doubling the length. It isn’t what I was initially looking for, but it’s taking this project in an unexpected ‘ketamine-like’ direction that I like. 
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At the risk of this not coming across in quite the way I intended it to: embrace the ketamine! 
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I find I get pretty good results in Live (discussed above) but also using Waves Sound Shifter P VST plugin. Heavy on the cpu though.
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