~snip~
Did you find a solution? If so: please post it for others to read in the future.
Given that there is no seed, and that Ledger has firmware that cannot be upgraded, I think that the only way to succeed is doing something advised by @nc50lc. Apart from that, I don't see how to approach this problem differently and solve it in a positive way.
I've seen this so many times.... How can so many people lose access to the single most important thing when holding Bitcoin?
I assume that the OP invested in Bitcoin back when it was worth maybe only a few hundred $ and did not believe that it would ever be worth what it is today. Before every bull run, we have the same problems - people realize that maybe they have something valuable, but also that they have a big problem that they can't access it.