When you summon Ventari’s Tablet, activate Protective Solace and swap legend w/o canceling the skill the reflection bubble and combofield will stay up for a long period of time. I assume this is 20 seconds as the skill states. But this gives pleanty of time to reproduce the method and get perma reflection w/o it draining your energy.
Here is a little videodemonstration if it helps: https://youtu.be/C7uhMcBEu2o