Would a 10G SFP+ switch port support a 1G SFP GBIC?

Yes, most 10G SFP+ switch ports are designed to be backward-compatible and will support 1G SFP transceivers.
This allows you to use a 1G SFP GBIC in a 10G SFP+ switch port.
However, this depends on the specific switch model and firmware, so you should verify with the manufacturer's documentation whether the Ruijie Reyee switch in question supports this functionality.