You can use your Mopho to control that VST via midi but you can't "load" a VST into an analog synth. I'm not aware of any hardware synth into which you could load a VST (not counting Roland's "plug-out" thing, which is basically that idea but very specialized). You need to run the VST on your computer and use the external keyboard to control it.
You’d have to use an iPad or a laptop if you want to run VSTs. You should be able to synthesize Farfisa sounds on any DSI synth, but usually people want to play chords on an organ, which makes the Mopho an unlikely candidate.
Right, but it's Garageband making the sound there. If you need something smaller than a laptop for that, you might try running Garageband or something on an iPad or iPhone.