Legal recourse in Spain is no recourse. Why go down the route & find oneself opening another front to defend ones rights/position.
I prefer to travel to where ever I need to in order to carry out the deed.
This also saves me the running around to Embassies, notary offices and the bureaucracy, civil servents slow working practises & associated cost.
Besides as I will be on the spot in the event that an unforeseen decision has to be taken. I am there & can weigh the pros & cons as the POA holder will not be aware of my immediate or long term plans or intentions.