Thanks for reaching here! If I have understood right you are leveraging "Wordpress for App Services" resource and wants to deploy on Azure's free tier.
As you mentioned Free tier not available and for hobby or research purposes, Basic App plan is suggested.
Please note that the Free tier has resource limitations, making it unsuitable Virtual Network Integration or high-traffic websites, while the Basic plan offers improved performance and functionality with potential usage costs.
Having said that suggest you share your feedback for Web App Uservoice -
All of the feedback, you share in these forums will be monitored and reviewed by the Microsoft engineering teams responsible for building Azure.
Additionally, users with a similar request can up-vote you post and add their comments.
Hope this helps.
Please let us know if further query or issue remains.