I’ve had quite a bit of success with a splint and plastic melting. Use metal pins about 15mm long 2mm diameter to make a locating position. Then, OUTSIDE and don’t breathe the fumes,, use an old soldering iron to melt the plastic around the joint(S). With some care, a repair done this way can be quite neat and strong.
The splints can either be like large staples fitting into pre drilled holes, or as a straight section fitting into holes drilled in each section.
Practice with some scrap plastic first!
Malcolm