Yes you can do this online, but there's a number of ways you could achieve this, simplest first
Evacuate the SSD tier by setting a limit on the CPG, suspend the schedule, then create a new SSD CPG and rejig the AO policy then re-enable the schedule.
Suspend the AO schedule, retune the VV's to the owning CPG then create a new SSD CPG and rejig the AO policy and re-enable the schedule.
Setup 3 new CPG's and AO policy, schedule, re tune the volumes into the new CPG and then enable the scehdule.
Don't forget to compact the old CPG's to return the space.
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