heh, the guitar swami was the joke of its day when still available in the market back then. Its one of the rare few pedals that i came across from multiple different forums where almost all who tried it, really hated it.
Some few who like it, dont use it for the sitar sound...
anyway, the sitar patch in roland guitar synth pretty workable, just for the sound.
Theres a aftermarket sitar bridge for electric guitar as well, but kinda forgot the name for it.
Theres diy pedal which is said to do sitar-ish sound, but its kinda fuzzy sounding, less of the characteristic of real sitar
and lastly, theres a digitech signature pedal for the geetarer dude from disturbed(the band), within that pedal, theres a sitar setting, which sounded quite ok.