Welcome to ECN, Ted.
This may sound odd on a electrical forum
, but if it were me, [and assuming this is a separate oven-hob worktop /counter setup], I'd take the easy option and dump the electric hob and fit a bottled LPG gas one instead, [Butano]. I believe you need to get the setup approved by a bottled gas supplier in Spain, [mandatory health and safety insurance inspection] when you sign the contract for bottle supply, which makes sense. The inspection is free.
You'll be surprised at the speed, better performance and economy of gas, now on a par with electicity btu-v-btu. The whole setup with the new hob, regulator and a gas bottle will come in somewhere around €200 depending on model, and automatically unload your oven's electical demand. If you live in the flat [US = apartment] 365 dpy, I doubt you'd use two 13kg bottles pa.