Service desk templates for create and manage.

I am finding it takes about 2 hrs to create a new service desk. We will eventually need to create about 50+ for the major customers of our SAAS product. The management time for this is outweighing the benefits of using.

We require : 'Create Service Desk for "Customer B", user "CustB User", project "CustB project", using Template "Customer A Service Desk" '.

i.e. Service desk desperately needs templates for:
issue types on the customer portal
sla definitions
calendar
single project permissions (i.e. copy from existing permission scheme, create new and add user group)
etc.

If we want to adjust the SLAs for all service desks, we should be able to change a reference SLA scheme, not edit each desk.

Alternatively:
Allow a single service desk to be setup with everything parameterised from the service desk name down to permissions etc. Requirement is for user from customer A to only see the single customer A project issues, SLAs etc.