Hi all, first time posting here .
SSPO, unfortunately no matter what you choose to do, you can't control how your daughters will react. If you have good relationship with them, they can by choice continue to have dealings with you as their father, DF'd or not. If they choose to consider you solely by religious standards and not by flesh and blood, then you will have to hope that one day they mature enough to realize the gravity of allowing any organization to dictate to them how they deal with such situations.
If you did nothing to warrant being DF'd why would you admit to anything that would give her the freedom to remarry? It's not being vindictive as someone mentioned, it's being truthful. If she truly loves her god she will accept the consequences of her own beliefs.
If you asked me “Would you make an exception and give her what she wants” Yes, under the following condition, monetary hardship, meaning if I knew she was having a hard time meeting her personal financial obligations, and I knew her getting remarried would be the solution, then I would gladly give her a letter, even if it was a lie. Since your not a practicing JW, you lose nothing at the end of the day. Call it a humanitarian act. You may suffer the unfortunate consequences, but your conscience will be clean.
BTW there’s nothing wrong with writing your daughters stating the facts, and leave it up to them to decide how they want to deal with it. I am assuming they are adults and can handle the truth.
Best of luck no matter what you decide.