trouble is you have to put a lot of effort into getting an unbundled policy -especially as you are over 70.
Even if you go to a broker they need to recover their costs from you
if your current medical insurance covers you in Spain why worry? The Spanish medical system is very good and you will be treated there - the only risk is you develop something that means you can't fly commercial home - that's not very likely TBH if you are currently in reasonable shape