Probably more bother than making a new door….,but doable.
I would try a heat gun, scrape off the paint at the tenons and using a screw pull out the wedges. Tapping to see if it comes apart. Most stuff will as shrinkage means the wedges will be a bit loose.
If not, just cut through the rails at the styles and rebuild using loose tenons. A loose tenon slips into the rail and the style and is glued / use Dominos
I would try a heat gun, scrape off the paint at the tenons and using a screw pull out the wedges. Tapping to see if it comes apart. Most stuff will as shrinkage means the wedges will be a bit loose.
If not, just cut through the rails at the styles and rebuild using loose tenons. A loose tenon slips into the rail and the style and is glued / use Dominos