While my last retrobrighting experiment proceeds quietly at home (*), I went to the asylum to finish restoring the #Amiga 3000 battery-backed clock.
My kit requires a P-channel MOSFET. Instead of the recommended IRLML6401TRPBF, I found a similar part with higher current (fine) but higher drive voltage (2.5V):
https://www.digikey.com/en/products/detail/infineon-technologies/IRLML6402TRPBF/811437
To confirm it will work, I taped the mosfet to its tiny terminals and measured +3V on the output pins.