remove outliers in 2d point cloud

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Hello everyone
I was trying to apply a pcl::RadiusOutlierRemoval to a 2D point cloud obtained by a laser scan when I realize that it won't work unless you use 3D points.... (at least so I figured out when my program had linking problems when using PointXY cloud and no problems by using PointXYZ clouds). I think to use PointXYZ with z = 0 will not be a good workaround for computational reasons.
Which kind of methods are available for clouds of PointXY to remove noisy points and outliers?
Thank you
Regards