That would open up root for atleast 22.214.171.124 if they can downgrade since lk version was untouchedmt8183 is basically the tablet-verision of mt6771, which is already supported by the utility (given you can access brom-mode).
AFAIK it has already been tested on maverick.
It will not allow downgrading lk/pl/tz however, since that would require clearing RPMB (which is not possible with SP-Flash).
Kamakiri could however likely be ported, which includes RPMB-Downgrade code.
You could try to downgrade only boot/system/vendor images and leave lk/pl/tz untouched.