I'm not sure if I understand the purpose of this build. Is it intended to be a ranged build using imbue damage with repeaters and sonic damage?
IMHO, the spellpower and number of imbue dice seems to be a bit low. In my experience, most imbue builds (at least with regular crossbows and inquis), tend to have 42+ imbue dice and 800-1k spellpower.
Is there any advantage of using the OP:s approach instead of a traditional ranged imbue build?