this is probably your best bet. you could also consider these types of transducers: https://www.amazon.com/Dayton-Audio-DAEX25CT-4-Coin-Exciter/dp/B00M292316/ref=psdc_10980771_t4_B00Q3M8PCY
Here's a demo showing how they work. Note... they are most likely not the world's best speakers... https://www.youtube.com/watch?v=gGzNkUmPdXc
Thank you for looking this up. It's honestly a great help.
Finding ways for people who want to interact with the display to inject the sound into resonant cavities has been a lot of fun. It's a great option to have a setup where the project can run without someone interacting with it. I really appreciate this suggestion.