@responsivearchitect. I believe you will be good with finalizing the sanding in the spring. We currently have a project where we are taking the identical approach due to weather closing in on us (Illinois) though ours has a traditional base, not a Brock base.

We do not sand with polymeric sand when the brick is still holding moisture from recent rains......too many potential headaches. This is our product of choice for most polymeric applications.

https://www.techniseal.com/en-US/professional/products/polymeric-sand/hp-nextgel-jointing-sand

While you probably can get away with finishing in the spring, I visualize a PITA cleaning/prep project then. I'd forget about polymeric, blow it off now (or your first decent next day) and fill joints with sand. It does not take that long. Even if you don't finish 100%, you could get brick well locked up. I don't see how polymeric is going to help you, but it will make the project harder (messier.)

I️ stopped using coarse sand/ washed sand years ago for paver joints because it allows weed seeds to fall between the joints and germinate. If the joints between the pavers are fairly wide, you can expect the pavers to shift out of place if joint sand is not applied and people are transversing the patio. Polymeric sand is definitely the way to go. Do not apply when the edges of the pavers are wet however, because the sand will stick to the sides and may cause a reduced amount to fill the joints and may cause hazing on the paver surface. The biggest issue when applying polymeric sand with wet pavers is hazing or sand sticking to the pavers. Very difficult to remove once that dries. If the patio’s upper surface is dry, considering the size of your patio, I️ would be comfortable applying polymeric sand. You will be getting the sand wet anyway once the sand is swept into the joints. The sweeping should be fairly quick. Just make sure to sweep/ blow off as much of the excess sand as possible, compact the pavers, finish filling the joints and water, water, water in and blow off the pavers according to the manufacturers suggestions so you don’t have an issue with hazing.

Looking again, you used the Gator pads (or something similar) without adding sand between the pavers and the pads. If that is correct, the compacting will not apply as you will not have setting sand into which to set the pavers. However, from your pictures, it is clear you will have no issue with using polymeric sand with the moisture at the base
Of the pavers.