Membership Subscription Access Levels Concurrent

We have installed the membership plugin and are protecting content with the shortcodes provided by the access levels.

We are then adding those access levels to a subscription plan and this is working great on a one by one basis.

Now we would like to start offering 2 for 1 type promotions and would like to create a subscription offering multiple access levels at the same time.

When we set this up it will only allow access levels to be placed consecutively where one expires and then the next one becomes available. We would instead like to offer access to all the access levels added at once.

How would this best be achieved?