The Ibanez ES-2 is a nice cheap analogue delay with an oscillation switch, great for space sounds.
Edit: just re-read and saw you were looking at this already. Consider this a recommendation! I used to use mine into my Small Stone, and I was really pleased with the results.
I haven't tried it, but I think the EHX Ravish Sitar might work well here too - turn off the "lead" sound and you get some synth-y drones in the background that "resonate" with what you're playing. You can send the drone notes to another amp/PA too.
Edit: just re-read and saw you were looking at this already. Consider this a recommendation! I used to use mine into my Small Stone, and I was really pleased with the results.
I haven't tried it, but I think the EHX Ravish Sitar might work well here too - turn off the "lead" sound and you get some synth-y drones in the background that "resonate" with what you're playing. You can send the drone notes to another amp/PA too.
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