The take home message is prevention, there is no bandage cure...get it

Bad crack

Here I am recommending, certifying and reinforcing mortar beds with 2 x 6mm galv rods to reduce wall cracking ?
While you've proposed another solution
Enjoy the humour

Bit of Joint reinforcement, simple stuff
Bandage from the chemist

How does render coatings stop cracking?
If this is correct you might be re-writing the entire masonry structural codes (humour)

The cracking is from insufficient glue in joint and incorrect render system
You are not alone with these Hebel Powerpanel builds. Would estimate about 95% of builds have cracking like…