Burner Phones for Demonstrations Pixel6a vs newer vs older Models

Cyberslut6161

Hello,
a burner phone is needed for demonstrations. For obvious reasons the choice was made for pixels with graphene OS. As it is only for demos the price should not be to high.
Currently pixel 6a is supported in installation. How long will a Pixel 6a will be decently usuable on demonstrations? (Encrypted communication, maps)
Are older models still a good choice with legacy OS installations?

Watermelon

Cyberslut6161 The most secure models are Pixel 8 and later, and models older than Pixel 6 aren't supported at all anymore. Check the recommended and supported devices lists in the FAQ on the official website.

de0u

Cyberslut6161 Currently pixel 6a is supported in installation. How long will a Pixel 6a will be decently usuable on demonstrations?

It is likely that the 6a's support lifetime by GrapheneOS will be based on Google's support lifetime: https://endoflife.date/pixel