Like a lot of folks I've taken a long route to get to GJ guitar, playing rock, bluegrass, straight ahead jazz, and classical guitar along the way. I'm interested in picking up my first GJ-specific instrument, and I want to commit to the techniques that are particular to this style, including the extensive use of the fretting hand thumb. This is new to me as my general approach to the fretting hand is more classical - my early attempts have been... challenging.
My question: I have an opportunity to pick up a used Gitane D-500 at a decent price, but I'm wondering whether this is a good idea, particularly considering the 1 7/8 nut width. The thumb-over-the-top technique is challenging on my dreadnought with a 1 3/4 nut, so I'm wondering if you all think that moving to an even wider fretboard would be a mistake. I'll have the opportunity to try before I buy. In your more practiced opinions, should I write off the Gitane if my thumb says "no, thank you" or should I buy the guitar and hope that my technique (and tendons) adapt?