Dynamically adding entities to PonyORM database from class definition

Question

Having class

from pony.orm import Required
class Place:
    name = Required(str)
    country = Required(str)

Is it possible to generate PonyORM entity from this definition with

from pony.orm import database
def initialize_database():
    db=database()
    adds_db_entity_connection(db, Place)
    db.bind(provider="sqlite",filename=":memory:")
    db.generate_mapping(check_tables=True, create_tables=True)
    return db

I have tried creating these from dictionary like {"name": Required(str), "country":Required(str)} with

    def bind_class(name, db, prop_dict):
        return type(
            name,
            (
                db.Entity,
            ),
            prop_dict,
        )

But this leads to

TypeError: Entity classes cannot contain __slots__ variable

I am aware of dynamic factory solution but this does not really apply to here. I have also tried adding db.Entity to Place.__bases__ but this did not work either as I suspect the act of inheritance is required to formulate database relation to the entities. Is the approach completely impossible?