I understand you are looking for a solution to provide secure access to M365 apps and Power Platform applications for your remote users while ensuring compliance with ISO 27001 standards.
Yes, Microsoft Entra Private Access can be used to provide a secure access solution for remote users accessing Microsoft 365 (M365) apps and Power Platform applications, even though they are cloud-based services. Entra Private Access uses a Zero Trust security model to authenticate and authorize users based on their identity and device health, similar to a VPN solution but without the need for traditional VPN infrastructure.
By using Entra Private Access, you can fulfill the ISO 27001 standard requirements for secure access while providing a more efficient and secure alternative to traditional VPN connections.
For more information : https://learn.microsoft.com/en-us/entra/global-secure-access/concept-private-access
Hope this helps. Do let us know if you any further queries.