Like slightly half not joking, but really it should work...

https://www.amazon.com/Vibro-Pro-Kinetic-Vibrating-Confectionery/dp/B019KNAZMA

Something like that, remove the top plate and then replace with a MUCH larger piece of wood, set it to low and it should work perfect.

Heck even something like this, https://www.amazon.com/Vibrator-Quartet-Plaster-Oscillator-Equipment/dp/B08GC32V1Z/ref=pd_lpo_1?pd_rd_i=B08GC32V1Z&psc=1

Use some 3m double sided foam tape to attach a larger piece to put more candles on at once, should work like a charm. Will 100% have to do some self testing with the settings and which speed works best. All you're trying to do is allow those bubbles to work out while it's cooling once it's done you can take them off and allow to cool motionless.

Just the amazon search results for different types of shakers.

https://www.amazon.com/Lab-Orbital-Shakers/b/ref=dp_bc_aui_C_6?ie=UTF8&node=318013011