Only the keycaps pictured on the product page will be included for the beam spring keyboards.
Model F caps are not compatible with Cherry MX beam spring keys.
The beam spring keyboards are fully functional with Mac computers, even if the legends do not perfectly match the legends that Apple uses.
If I understand you correctly, any Cherry MX compatible keycaps should work with the Beam Spring keyboard. And so I can buy Cherry MX Mac keycaps from another vendor, and use with with my Beam Spring keyboard.
Is my understanding correct?