I would suggest to address this question to someone proficient by using an @ address (I suppose that a personal message would be sent but I admit that never tried it myself)…
@blank13
while the answer to your question is no (“can I call a custom node”),
the goal you are trying to achieve is possible (“as I would like to loop it”).
Obviously, you can loop over it by feeding a list of points, but if you need to customize it (ie use different types as inputs, you can just use the code from the custom node, which is quite simple, as a function in your python code.
Example below (not tested)
fam_instance_by_point(point, famtype, lvl):
# From FamilyInstance.ByPointInView.dyf at
# github.com/andydandy74/ClockworkForDynamo/
TransactionManager.Instance.EnsureInTransaction(doc)
# make sure familysymbol is active
if famtype.IsActive == False:
famtype.Activate()
doc.Regenerate()
newobj = doc.Create.NewFamilyInstance(point.ToXyz(),famtype,lvl)
TransactionManager.Instance.TransactionTaskDone()
return newobj.ToDSType(False)
created_instances = []
for point in points:
element_instance = fam_instance_by_point(point, famtype, lvl)
created_instances.append(element_instance)