Years ago I made a custom, laser cut, neck support out of acrylic and weather stripping for the padding. Designed it myself to be a perfect fit for my guitars. Even engraved the thing with music graphics and whatnot. Worked perfectly.
Used it twice I think. LOL.
I still change my strings on my lap to this day.
===================================== One Alvarez in the hand is worth two Taylors and a Martin in the guitar store!