@Danny Kroeze As of now it is not possible to force sync for specific users/groups/group members.
The following table summarizes synchronization times for common provisioning scenarios. In these scenarios, the source system is Azure AD and the target system is a SaaS application. The sync times are derived from a statistical analysis of sync jobs for the SaaS applications ServiceNow, Workplace, Salesforce, and G Suite.
If performance becomes an issue and you are attempting to provision the majority of users and groups in your tenant, use scoping filters. Scoping filters allow you to fine tune the data that the provisioning service extracts from Azure AD by filtering out users based on specific attribute values. For more information on scoping filters, see Attribute-based application provisioning with scoping filters.
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