Not sure how well it will work in practice, as I've never tried it myself, but theoretically you could connect the iPad to a bluetooth transceiver with 2 wired outputs, then use that to connect both your headphone pairs via their cables, such as this Avantree Audikast Plus Bluetooth 5.0 Transmitter for TV with Volume Control, aptX Low Latency Audio Adapter for 2 Headphones from Amazon.

This is what you need:

https://www.amazon.com/dp/B07TLHRPDP?pd_rd_i=B07TLHRPDP&pf_rd_p=70be68f9-b322-41f4-90df-6aa261b03da4&pf_rd_r=CYT2K64226AZYN3KSCZ4&pd_rd_wg=ecgzf&pd_rd_w=bZkKl&pd_rd_r=b881ad34-a591-46da-8581-7fff39e96044

Or if you prefer to look for more options simply search "bluetooth transmitter" on amazon and in the product description check that it supports dual link, I have seen several that support it 🫡