Don't think you need a downhaul with a cruising chute as it attaches direct and flies like a genoa, but you would need a downhaul with a spinnaker which uses a pole, or if you are using the pole to pole out the genoa. You might need a 'barber hauler' I think they call it on the crusing chute to keep a down pull on the chute sheet but someone wiser than me will probably comment on that.
My Trapper came without a downhaul but a word with the previous owner and I found out where he rigged it. The reason it wasn't a permanent fixture like the uphaul was that it leads back to the cockpit and then across the foredeck to a block at the fixing for the inner stay. So the fewer lines to trip over when you are sailing normally the better. I now keep the downhaul in the spinnaker bag.
On my old boat a Halcyon 23, the downhaul was fixed to the base of the mast and the uphaul and downhaul weren't adjustable they simply clipped onto the pole and held it parallel to the deck. The Trapper uses the storm jib halyard (which may be a dedicated uphaul) but on my boat it does the two jobs as the inner forestay is not an original Trapper fitting.
A cruising chute does not need a pole, but a spinnaker (or even a whisker pole, meaning for polling out a head sail) does.
A downhaul/foreguy for a spinnaker pole/whisker pole can be rigged using a temporary block on a short strop attached to the mooring cleat on the foredeck.
I suggest then that you rig something along the lines suggested above.
On a Westerly Berwick we took a foreguy down to a block temporarily attached to the mooring cleat on the foredeck and then back to the cockpit where, IIRC, we used the cleat normally used for the genoa furling line.
Attach to the pole in the same way as the uphaul/topping lift; a central attachment point or better the pole end. I am guessing that the Pageant has an inner forestay/babystay, rather than forward lower shrouds, which may rule out gybing the pole end for end. If so bridles for these two controls offer no advantages.
I am sure there are better links but you may find THIS ONE useful.