NS changes work without issues and are quite fast.
I used the bodis sale landing page. I'm actually negociating a sale as we speak for one of my LL.al domains with a private user who used the bodis landing page to make an $1600 offer.
I listed a few of my LL.al with sedo also. It was a bit more complicated but it worked. You would need an external NS. I used my digitalocean to verify, forward and have catchall mail.

...so...DNS / NS & advetising not an issue
Wish I had these end-user offers for all my domains. I would not have to deal with all the reseller low-ball offers and typical BS