Well the only reason I think it wouldn't be that difficult is because, when you create a new custom you guys redid the code some, now when you make a new custom.. you get one free restring, short/long/name.
So basically you'd just create that scenario with a token. For <target> object.
Hmm, I don't know how you guys would do it tho.. the easy way.. "however would be easiest" or whatever way would make more sense, "only one flag, all items, only customs maybe, all flags on one item, all flags on one custom"
All I know is on Sye, I restrung <all> of my gear, <all> flags, AT LEAST three times already.
It costs a lot