Vortex Warp (Strixhaven: A Curriculum of Chaos, p.38):
You magically twist space around another creature you can see within range. The target must succeed on a Constitution saving throw (the target can choose to fail), or the target is teleported to an unoccupied space of your choice that you can see within range. The chosen space must be on a surface or in a liquid that can support the target without the target having to squeeze.
And the Water Elemental's Water Form states (Monster Manual p.125):
The elemental can enter a hostile creature's space and stop there. It can move through a space as narrow as 1 inch wide without squeezing.
The reason I'm not sure whether this will work is that the elemental is stated as being able to "enter another hostile creature's space and stop there." Does this also mean that a creature could forcefully be put in the elemental's space? The spell says "the target is teleported to an unoccupied space," but for the rule of 'specific beats general,' is the elemental's ability more specific or the spell?