Related issue: https://feedback.secondlife.com/feature-requests/p/add-support-for-prim-link-target-to-llsetlinkgltfoverrides

Given the command structure of llSetLinkGltfOverrides, if the related issue is merged it may be useful to be able to swap which face (or, ALL_SIDES) is being worked on after the initial selection. Unlike llSetLinkPrimitiveParams , the face selection does not happen within the parameter list, instead happening at initialization of the command, so give the user an option to swap which face is being targeted after initialization.