I agree. If the razor does have a geometry that is not within the fabrication tolerances of the fabricator, get a new one. I have not been able to get that information from any vendor. I doubt e.g. Dovo or TI would give that information.When you buy a new razor with a bent spine the first thing to do is return it to the supplier for replacement. Trying to hone it will probably result in the seller refusing a refund. That is the message you should be trying to get across.
If you are asked to hone a razor with a bent spine you can always use a rolling action to ensure all parts of the bevel get attention - that’s where the experience, that @JamieM is referring to, comes in to play.
Your photograph of the Heljestrand above - what stone would you have used as a finisher if the spine was bent?
If i had bought a custom razor, i would expect it to be close to perfect.
If a mass produced razor like Dovo had tighter tolerances, the price of that razor would probably be higher. If people started to send them back they might be forced to do something.
If you buy a razor from Jarrod, i would assume that he does some evaluation of the razor for you, and sends razors that have slipped through quality control back to his vendor. If you did buy a razor from him which for some reason you are not able to hone, and claim there is something wrong with it, i am not sure what he would do. He might just hone the razor for you and send it back, just to keep you as a happy customer, or he might tell you how you can hone it.
I bough a razor from a well known retailer in Norway. The photo showed a shoulderless dovo masters edition, which is stainless i believe. They sent me one with a shoulder, which is in carbon steel. I sent them an email were i said i do not care that the razor is not as advertised, but you should at least replace the picture on you web site. They still use the same picture. So what is the point. Many sellers do not have a clue about what they are selling, so trying to explain to them that this is not going to be ease to hone on a flat stone might not make sense to them. If you are lucky they will just send you a new one, without inspecting it.
The rolling x stroke only works on the curved side of the blade. A normal approach will be to hone the concave side of the razor in sections. Heel leading strokes for the heel, toe leading for the toe. The middle can be honed using the corner of the stone. At the end you can blend it together. Some of the initial unevenness can be adjusted by adjusting the high spots on the spine, and try to hone in/to a little smile. This is probably easy for JamieM, and might be part of the reason he hones 100 + blades a year.
If my Heljestrand had a bent spine i would have finished it on a convex finisher, like a coticule. I would like to preserve as much of the razor as possible. This was a new old stock. I can't just buy a new one, or get it replaced.

