Unable to to change Structure item Type from Standard to Formula for existing item structures

We have one BU which has gone live with Product Information Management for which the item structures has already loaded using Standard item structure type. Post 25D release, when Formulation were introduced, there is need to convert these structure type to Formula. The system does not allow us to change the structure item type.

Client is looking for Strategy/Solution to convert Standard item structure to Formula item structure. This is currently not being permitted by the system.