very risky.
first CIS may think you did not work enough time for a national interest job, will RFE you to explain the connection between 2 jobs, if you can not make them believe it is still of national interest at the same area your applied at beginning, you may have lost 50% chance;
2nd if denied, you I-485 will be denied at the same time unless your EB1a approved before your NIW. You may have to file again.
first CIS may think you did not work enough time for a national interest job, will RFE you to explain the connection between 2 jobs, if you can not make them believe it is still of national interest at the same area your applied at beginning, you may have lost 50% chance;
2nd if denied, you I-485 will be denied at the same time unless your EB1a approved before your NIW. You may have to file again.