Syncing Arps from Polar to drummers click

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You could get a SMPTE to MIDI reader & stripe a channel on the HD recorder with SMPTE in sync with the backing tracks. Then read that back with the reader & send the clock to your virus to get the clock in sync.

That doesn't help with your arp triggering but...

If you were using Ableton to playback your tracks, you could program your arp tones into clips that are precisely quantized which you trigger with a MIDI whatever.

Or at that point, sequence the clips and drink a beer since you've successfully programmed yourself out of the gig