The Regional Sponsored Migration Scheme (RSMS) subclass 187 allows employers in Tasmania to employ skilled migrants if a position cannot be filled by an Australia citizen or permanent resident.
If you cannot wait until the babies have fledged you may contact a licensed wildlife cooperator to help you find a solution. Chimney swifts are protected by the Migratory Bird Treaty Act and a federal permit is needed to remove birds and their nests during the nesting season.
The chittering in your chimney may actually be birds and not bats. Chimney Swifts are migratory birds that return to Maryland in early April from as far away as South America. Like bats, these birds once nested in old hollow trees and now nest almost exclusively in chimneys because old trees have been removed from the landscape. And, like bats, they eat lots of flying insects.