Ahhhh yes.I've fleshed and dehaired them that way before too after fleshing them good on the same beam.Makes for a smooth hair side surface.Many quillers and bead workers like that type of surface to work on.They usually call that the wet scrape method.Just like fleshing a coon.
Here's a picture of my beam fleshing tool.I've had this tool for 40 years.The outside 2" on each end are sharp while leaving the center 10" to 12" dull.
A semi dull scraper in that case is the best to use.One that you can run your finger across length wise with no fear of cutting yourself.Many times just a good soaking in water is enough.Don't even need to lime it and then delime and rinse it.
Frankly the flank leathers' usefullness is'nt much more than used as fringe anyway.Very thin and very stretchy.
I've removed those slight peppered hair root remanants before after dry scraping by soaking the hide in water and using a dull fleshing knife on a beam too.Then if the brains are ready I brain it and rope it dry right then without reframing it.
Dry scraping leaves a fuzzier surface.
Finished the stubborn to remove hair roots on the older big doe up with a lot of sanding.Nice smooth surface then too when finished.Used to do that by hand.Nowadays I use a palm or orbital sander.Suprisingly I used 40 grit on that doe and it worked.Right around 13 to 14 square foot there.Should end up with at least 10 square feet of brain tan from this one.Perfect for shirts and such,or even a shorter legged full lengthed pants pipe.Notice how narrower the necks are on these does.
1 more 1 and 1/2 year old doe to do and then I'll start braining and roping them all dry.