FieldConverts interppoints (and other) module creates new expansion instead of using the exisiting ones

FieldConverts interppoints (and other) module creates new expansion instead of using the existing ones.

This is the correct behaviour according to the userguide and the modules priority but i wonder if there is any reason why they shouldnt use the existing expansions instead. This way, one could e.g. combine the C0Projection module with interppoints to perform a helmholtz smoother before the interpolation.