Sorry i have not seen that was a 3DM !

So same method with the Rail Revolve (possible because same Top and Bottom profil )

Then View Points and move bottom pts horizontally to the ring

Take these new surface Top Bottom Face / Planar

You have a solid

Applyy any boolean DIff with trapezoidal profil if wanted (not made here)

Boolean Merge with The Ring (ring)

You have some draft variations for explore that you want...