I was going to say this should be easy, because we took the same journey by bus in the other direction four years ago: https://www.cycleblaze.com/journals/iberia2019/to-malaga/. But then I looked at Alsa’s baggage policy (they’re the carrier on this line), and saw this:

From January 10, 2024, access to the bus with electric scooters is prohibited on all Alsa services. This prohibition applies not only to electric scooters, but to any other mobility device equipped with batteries.

So you might want to contact them to see if this includes e-bikes. Another possibility would be a one-way car rental, but you need to have an international drivers permit. Easy to get from AAA, if you haven’t got one. I should probably do that myself, just in case.

Last time in Santiago we failed to find a train out and had to throw the bikes under a bus. This time we think we have found a ship bikes service that could take them to Pamplona, and we'll follow by train. But we are most likely to trip up with Malaga to Cordoba. We are Booked on either side of that gap and could not afford the three days if we had to pedal it.

Ambitious! I hope it all works out for you, and we’ll look forward to following along. I don’t remember if you’ve taken the train in Spain before, but do your research - it’s not France.

Also, I see you’re planning on some birdwatching on the way to Huelva, which I assume you’re hoping for in Doñana National Park. Don’t get your hopes up too high though, because the birds are all down in the delta near the sea, and you can’t bike there. It looks like you’re staying in El Rocio though, which birds or no birds is an experience not to be missed: https://www.cycleblaze.com/journals/iberia2019/el-rocio/. You should watch the video so you know what to expect.

Wishing you a splendid trip. We are still hoping for Spring in Burgundy and surrounding areas.
The Cyclingsantas

You both are so inspirational! Have fun!

I admire your foresight for fun! Looking forward to following along from the armchair!