Don’t compromise go composite
Composite doors are incredibly strong and secure, manufactured to modern techniques in a quality controlled environment and comprise of a hardwood inner frame reinforced for rigidity, set around a thermally insulated polyurethane foam core. The slab of the door provides a template which can be modelled with openings of any size or shape; therefore it is possible to reproduce any pattern of door so you do not have to compromise on style for the sake of practicality.
With a composite door there is no compromise, composite doors offer all of the benefits of wooden and UPVC doors, but none of the draw backs.