Do you offer an alternative to the self locking nut DIN 6927 ISO 7044?

yes,

we offer an alternative to DIN 6927 ISO 7044 locking nuts, which has also a metal ring.  However the alternative does not have a flange.

available in steel zinc plated and stainless steel.

Here are the dimensions:

example of part number ALNhsrM8x125CL8

The nut can also be made with a flange, but then the option is only available in steel zinc plated: