I would suggest:

- Create an user for that in your Odoo and give that user the needed permissions

- Extend the create method and force that user to be the creator, like:

res = super(HrComplaint, self).with_user().create(vals)

Hi,

To hide the 'create_uid' field, you can override the 'fields_get' method of the model and remove it from the returned fields. 

class HrComplaint(models.Model):
_inherit = 'hr.complaint'

@api.model
def fields_get(self, allfields=None, attributes=None):
res = super(HrComplaint, self).fields_get(allfields=allfields, attributes=attributes)
if not self.env.user.has_group('base.group_system'):
# Remove the create_uid field for non-system users
res.pop('create_uid', None)
return res

In this 'fields_get' method of the 'hr.complaint' model and remove the 'create_uid' field from the returned fields if the current user is not a member of the 'base.group_system' group.

Hope this will help you
Thanks