It is easier to balance a split handstand. Here is a nice example at .38 if you ignore the underarm action. Step 4 Beam - Routine minus dismount - YouTube
To help them feel the position put a spotting block at the end of the beam and use it to balance the bottom leg while they lift the top leg to vertical/just past.
To help them feel the position put a spotting block at the end of the beam and use it to balance the bottom leg while they lift the top leg to vertical/just past.