Hi Marjude, my friend and I took the train from Barcelona to Zaragoza then walked upstairs to the bus station and caught bus to Jaca.From there bus to Somport arriving at 3ish we then walked down to Canfranc Estacion to spend the night.
This shortened the next days walk.
I too am thinking of the Salvador and Primitivo next April but have recently been discouraged by a younger friend saying that she thought it was too hard for me on my own. Of course she walked in very hot August.
Decisions!!
Ignore the dire warnings of younger friends, especially since you are such an experienced peregrina. It is true that April might have snow that would make it impossible for you to get through the pass (see jpflavin's accounts of his Salvador in April on the forum), but that would be true for a young pilgrim as well. If you decide to keep the Salvador as an option, I would suggest being in touch with Ender as the time gets near (he's the one behind the Camino del Salvador facebook page) -- he will have up to date information on the snow conditions.
And btw, I just checked his facebook page and saw that there is a new albergue in Benduenos (off the camino a bit and before Campomanes, and the post says that the owner will come pick you up -- looks awesome) and there is a new edition of his Salvador guide. But it's in Spanish.
https://drive.google.com/file/d/0B61VvtkuNOwEX09kcEJaOGlteTg/view
It's the most complete and detailed guide I've seen. Lots of pictures and detailed walking instructions. Anyway, sorry to hijack the conversation over to the Salvador.
Back to the Aragones -- we did the same thing camino07 -- We walked from Ena on the Catalan past San Juan and down to the Aragones at Santa Cilia. We were lucky to get a ride all the way up to Somport, and then walked down to Canfranc Estacion. What a gorgeous walk! The second albergue (more highly rated) was closed, so we went to the first one, and it was fine.
The incredible train station is now open for guided tours but check the hours because it's limited. We missed the only tour of the day, unfortunately. We did spend about an hour poking around the grounds but the main building was locked up tight and only open to those on the tour.