This is probably a dumb question, given this is not on the list of supported devices... but any chance that that this Lenovo tablet might be compatible with Ubuntu Touch?:
https://www.lenovo.com/us/en/p/tablets/android-tablets/lenovo-tab-series/lenovo-tab-m9-9-inch-mtk/zac30056us

• Processor: MediaTek Helio G80 (8C, 2x A75 @2.0GHz + 6x A55 @1.8GHz)
• Operating System: Android 12
• Memory: 3 GB LPDDR4X (Soldered)
• Storage: 32 GB eMMC
• Display: 9.0" HD (1340 x 800) IPS, touchscreen

Obtainable at low cost, would love to get Linux onto this puppy

Thank you!!