In either route, be sure that you DO NOT UNDERESTIMATE THE EFFECT OF THE TIDAL CURRENTS! Be sure you are able to read the tide and current tables properly, target for within 30 mins of slack for any pass you intend to use. Boundary pass does not have its own tables in the government books, IIRC, but the currents there can be substantial, and because it's not a narrow "pass", can definitely catch you off guard.
Other than that the boundary pass route is the most straightforward if you're going to Bedwell from PR
. and btw don't be tempted to use the canal between the Penders - you won't fit!
Agree that active pass is not really a problem, the ferries announce their entry on VHF, and it's quite possible to transit outside the ferry schedule if the tides permit. Since it is the halfway point for the ferry route, though, you'll often meet two of them there going in opposite directions!