[chrnad]

Does anyone know if you can disable email on GSuite (i.e. change MX on my domain to Fastmail), but keep the rest? I use my GSuite account login on a lot of sites, I've got shared photo albums etc.

[ianmf]

I do this. I use Gsuite but not their email. I changed the MX records of the domain to the other email host.

[dual_basis]

Yes