While this example is not in a comparable starting position to the OP, there are ways for higher Norwoods (5+) to camouflage there position by taking a different approach and using FUE to essentially replicate a similar kind of result you would be looking for with SMP but using actual hair,
you wouldn't be trying to create a covering of hair that you can actually grow out and style, but you would be attempting to provide an illusion of coverage by evenly diffusing out your donner and creating a more even look throughout the entire scalp.
this example is only about a Norwood 5+ at the time but potentially there would a possibility to diffuse out the donner to a greater extent than this as long as its evenly done and still create an SMP type of effect, the key is the skill of the surgeon and clinic involved.
(its not something you can expect the average hair transplant surgeon to do or you would have a terrible result)
this guy is one of advisors that works for BHR (7000+ grafts or so over 5 surgery's.)
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Full post about his case is here
https://www.hairlossexperiences.com...inic-7000-plus-fue-norwood-6-restoration.797/
I take it his hair loss was still progressing since 2006 so he probably is a norwood 6+ now underneath his transplants.
but yes if have reached the situation like the OP anything like this is still probably outside the realms of possibility.