Acoustic Exciter (DIY Tonewood amp)

The project: a small portable setup that feeds a guitar pickup signal thru a processor and back into the sound chamber of an acoustic guitar. Hopefully done with just enough power not to create a feedback loop but to provide ambient effects to the sound. Tonewood started it with a magnetic box stuck to the back of a guitar, Kepma acoustifex has a soudhole pickup/speaker.
But now manufacturers are providing it in their models likeLAG Hyvibe and Yamaha Transacoustic

I will be using a magnetic acoustic pickup and irig for the processing. It has a headphone out.

The exciters I think will use are the Dayton Audio DAEX13CT-8 3w or 4w coin type exciters. Dayton does have a small rechargable battery amp combo but i dont think it has an input other than bluetooth.

I already have a 20000mah powerbank that puts out 5v in 2.4A or 1.0A.

Suggestions for a small form factor amp to drive these?
or other suggestions?