Hi Izzy. Good post; your losses, your back, how brave and positive you are, lovely ... I certainly hope that you will not get any 'shaming' on here!
I would always advise the Frances - well, what to say? If you feel called, and you do, then I think that a tour company would not be a good thing for you - if you
pilgrimage then I do think you have to go at your own pace, stop where you will, where that inner voice tells you to, and so on - and you don't know who you are going to meet - what happens if you meet a person who has suffered the same loss that you have and you want to walk with them for a few days at a different pace?
I haven't used baggage services so don't know much about them but I think they are all the way down the Frances Camino and easy to book, and cheap too - others will know.
I know that your situation is different, body limitations, but it is common to have a pre Camino fear that one wouldn't be able to cope, would be lonely, and so on and therefore lean towards the 'safety' of a planned tour whereas the opposite is true - if one is open - the Frances is well used, with lots of refugios and places to eat ... in a way you are 'gifted' a group of pilgrims from day one, as they start on the same day as you (if you don't like them take a day off and pick up another group) ... and it is quite outstanding how many lifelong friendships are made and also how the group dynamics can produce caring and support ... so I would say do not be afraid, if you are called then someone else walks with you already - so maybe not a guided planned tour but baggage services along the way?
I don't know if you have considered it but there may be another option - a hiking trailer, as long as it isn't a monowheel design as they are awful as the design leaves half the weight on your body, but a two wheel design that has the load over the two wheels, leaving almost nothing on the hipbelt. Radical Design sell them but their absolutely brilliant build quality and design is reflected in their price -
https://www.radicaldesign.com/walking-trailers/wheelie-walking-trailers
I see that you are in the USA .. I was hoping that you were UK based as I would offer you my trailer - no weight or stress on the back whatsoever and complete timeline independence.
This is mine (modelled by a friend) though I have now put larger spoked wheels on it.
View attachment 151919
I think that you will get many supportive responses and good advice too, for all options - this has only been my personal opinion and there will be members who always use guided tours and think they are wonderful, so take in all the information and decide what is best for you (I know you will anyway).
And later - will you let us know what you decided, how it went (let alone how you got through airport metal detectors
)