Yes.
You can use your prefered VST host, and connect it with a virtual midi cable.

vArranger now includes an ASIO low latency synth, with SoundFonts support. So you can manage your own soundbanks like you want.

I will maybe include a VST host with vArranger later.

Frank, we can't use iPad to run vArranger, but some musicians are using the iPad as a touch screen for their PC with the splashtop app, who displays the PC screen on the iPad.