The rules and regulations surrounding marriage licenses vary depending on the jurisdiction, so it's essential to consult local laws and regulations for accurate advice.
In most places, having witnesses sign the marriage license is a legal requirement to validate the marriage. The presence of witnesses is meant to ensure that the marriage ceremony was conducted legitimately, and both parties willingly entered into the marriage contract. If you were to have witnesses sign the marriage license after the fact without their actual presence at the ceremony, it could be considered fraudulent and may lead to legal consequences.
Engaging in such behavior is generally not advisable and could potentially invalidate the marriage. Additionally, forging signatures or providing false information on official documents could lead to serious legal consequences, such as fines or even criminal charges.
If you have concerns or specific circumstances that make it difficult to have witnesses present at the ceremony, it is best to consult with a legal professional or the local marriage registration office to explore alternative solutions or obtain the necessary guidance.