There has been some interest in this little (and I do say LITTLE) guy. https://www.parts-express.com/gento-sp99023a-2-paper-cone-full-range-speaker-4-ohm--299-546
Fs is quite a bit higher than specified, but generally pretty smooth, and with surprisingly low distortion.
Not sure how I could add mass to the little cone for independent T/S specs, so nothing on that front.
Pretty efficient, should make for a nice CBT array, but the terminals are TINY, and do not look amenable to a press fit connector.
Good airflow for a pressed steel basket