The manufacturers of these Chinese tablets seem to be very good with spares. I know of a case where Cube sent out a replacement screen directly to an end user (that’s why I took a chance on a Chinese tablet to start with and I’m glad I did).
You’ll need to heat up the edges of the old screen (while protecting the display) and gently pry away the old screen shards (which looks tricky) but it’s definitely doable and it’s not like you have to worry about breaking the existing screen 🙂 Still, do that first and if you clean the tablet successfully get the replacement screen (cover the tablet in the meantime, ideally with a static dissipative bag, to avoid dust getting in and take ESD precautions (wrist strap, mat)).