I doubt it could be done internally. But many audio DAW programs can now 'snip' a loop and change straight feel to swung and vice versa.
The problem tends to come in fills... It's not so much the eighths (the core beat of the pattern) but the beats INSIDE the eighths. A simple timebase switch rarely gets those dead on. Of course, with a MIDI style, you can edit that, but audio is MUCH trickier. Requires a fair bit of hand massaging to get acceptable results.
Anyone that jacked around much with ReCycle in the early days of D&B can tell you about such things, or if you use Beat Detective with ProTools, or 'Elastic Audio' with many other DAW's, you may have run across these issues.
If the Audya's loop import features are finally completed, doing this to an audio loop would be tedious beyond what it already is on a MIDI arranger, but at least it OUGHT to be doable..
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An arranger is just a tool. What matters is what you build with it..!