Please follow the link , may be this can provide a better idea on this topic

https://www.sciencedirect.com/topics/engineering/nitrogenase

Yes, you can consider protein engineering.

it is possible to study likelihood of improvement of this enzyme which may be beneficial in fixing atmospheric nitrogen, using bioinformatics approach.

Regards.

Not a viable option. Nitrogen fixation happens in nature and you can not modify enzyme outside your lab strains.

Experimental work can be done, but not applicable in real world scenario.

Please follow the link , may be this can provide a better idea on this topic

https://www.sciencedirect.com/topics/engineering/nitrogenase

Fawz Al Saffar

Please check the following links would provide you information about nitrogenase bioengineering etc.:

Article State of the Art in Eukaryotic Nitrogenase Engineering

Article New Ways to Nab Nitrogen

All the best

dear friends, thank you all for your interest in answering my question