Thanks very much for the response. I do have that book and numerous others and reference them frequently. I am trying to avoid mistakes, so before starting the final rigging I am making (to the best of my ability) a full rigging plan with all belay points and identification of the run of all lines (blocks, attachment points, etc). This has really led to a lot of questions and obvious issues with provided rigging plans. I actually have mapped the belay points for each line as provided in the Artesania plans, McKay's "Anatomy of the Bounty" book, the Occre bounty plans, and my books (such as Petersson, Lee...). Honestly, it was shocking to me, but I suppose experienced model makers would shake their heads and laugh at the Newbie, but there is almost zero commonality. I have been working on it way too long.
Anyway. your answer got me thinking about my assumptions on this issues. I did think about this as you described, but initially dismissed the thought for two reasons:
1) The blocks on the mast and boom are both fixed, so the tackle really does nothing (it is still 1:1 on the lines)
2) There is no mention of an "inhaul" on the gaff sail aft/bottom end in any of the plans
But, after reading your post, I was thinking that there is a solution that works in support of your thoughts
1) The blocks attached to the boom must actually not be attached. The need to act like normal tackle in conjunction with the blocks on the mast
2) There must actually be an "inhaul" to pull in the bottom end of the sail. This makes sense to me as the brails are quite high in the plans and there would still be a lot of canvas still loose when this sail is brailed up.
If this is all true, then I would imagine the rigging would/could look like below.
Looking forward to hearing any comments on whether this makes any sense.