1 inch quill like a Schwinn, or 1 inch quill like a French, or a 1 inch quill like a JIS? Or 1 & ⅛ quill, like on mountain bikes? Or 1&¼ quill like on 90's Treks & Gary Fishers? Which one it is will determine the chances of success.
Your current fork will need a tab welded on. The Amazon kits are garbage. Besides your fork was never designed for the load a disc would impart. The left blade would need to be replaced.
A custom fork would be easiest. A frame builder could build one. The local shop (to me) will do it for about $800