soak the accent strips for a couple days in a solution that is water proof(NO SILICONE) let dry several days then build the deck.

The obvious question is: what is this miracle solution? You aren't actually seeking "waterproof" because that just means that water doesn't break it down in some way. It sounds like you are seeking hydrophobic, or something that water doesn't stick to. One of those treatments they show where the dude pours wine on his shirt and it just rolls off.

I don't know what these treatments are, but if water, wine and mud don't stick to it, what else doesn't? Can you use a water-based glue to stick to it? Does epoxy stick?

Regarding the scraping technique you referred to, that was probably me. I use an accent strips like the one below (no stain on this one). I'm really not sure how happy an experience the shellac masking system would be a on a strip this narrow. Below that is the scraper I use to clean off the stain. I can use this with a straight edge and it is pretty effective.