You won't get the full set of security measures (those require newer Google Tensor chipsets with ARM Memory Tagging Extensions, so Pixel 8 and later), but it's still going to be far more secure than any Android or even iPhone.

Regarding NFC payments, the apps themselves refuse to run on non-vanilla OSes due to spurious security concerns and Google's maneuvers behind the scenes, but there are reports that Curve Pay works, at least in the UK.