There's a very simple solution for avoiding overly lowered Ready recasts.. Simply add a unique lower bound. There are other JAs with something like this (COR's Quick Draw ability for example has a lower bound far above the otherwise standard -80% delay reduction cap,) so it should be at least technically possible to implement a lower bound of 10sec minimum Ready charge recast.

There we go, now there are no worries about adding new gear options for Ready Recast-
Personally, I think that if they want to encourage BST master-melee, they'll need to give us the recast- in non-weapon slots. Whether this is done via equipment, Gift adjustment, Merit Point Category adjustment (would just need to change a "1" to a "2" and Charmer's is obsoleted,) or baseline Job Traits doesn't really matter to me at this point.. I just want to see it happen so that it's feasible to play the job the way the devs envision it's ideal playstyle.