Set up bulk permissions for new members of staff. Merged

We have several members of staff who need to see the same 'Employer' accounts. When a new member of staff joins our company we need to send individual invitations for multiple Employers to allow access to their payroll information; at this time this is around 100 invitations (growing). I would like to be able to complete this task for multiple Employers simultaneously rather than having to send 100 individual invitations.

Also - as Owner/manager of our business I would like to be able to be the 'Owner' of our Employer accounts in 'User Permissions' but other members of staff 'Add New' Employers to the list and those members of staff automatically become the 'Owner' of any Employer they add. If a member of staff set up, for example, 100 Employers in the software over time, then moved employment we would need to have that member of staff change the 'Owner' for all 100 Employers before leaving if left in their own name. For this reason it is prefereable that the 'Owner' is someone who is unlikely to leave the company to prevent continual 'Owner' changes. (Unless this could also be completed for multiple Employers simultaneously)

Further to this it is possible to add a new Employer and base the User permissions on the settings for another previously added Employer but this facility is only available to the 'Owner' - could this be available to a member of staff who has 'Admin' permission level so that the Owner can be changed to someone who may not be adding new Employers to the list?