Blade flicker works by segment for the blaster blocking just not the FoC. I've not had time to read the revised manual for the 2nd gen boards released in the new batch but I believe there are some new features that enable overdriving of the main for hits and blaster blocks, a little like the old hyperblade, as well as some other gesture based fx. Not sure if these work with segments or the whole blade but it might alleviate the need for a FoC strip at all if you don't mind same colour flash.
If you are going to make a FoC strip it's a choice of seriallel or full parallel. Tbh for the time it's lit the power wastage vs hassle to wire ratio favors a parallel strip with resistor imo.
Can't really advise on mods to a Makoto blade as I've never owned one. Common sense says that if you have a dual string the sensible option to change it top serialllel would be to link the relative parallel segments of each string together in series but it all sounds like more trouble than it's worth.
My advise is ... man up and make your own