You can't usefully donate organs if you commit suicide. Suicide leads to autopsy leads to unusable organs.
This covers donating brains too, so to a first approximation, cryonics won't work for you if you suicide.
With that said, I agree that if we assume for the purposes of argument he could have donated his organs, and he cared enough about others to donate his life insurance to charity, he would probably want to donate his organs too.
I wonder how long before an insurance company decides to test cryonics as an excuse. "We respect his belief that he is not dead, but rather in suspended animation."
In secret, an unemployed man with poor job prospects uses his savings to buy a large term life insurance policy, and designates a charity as the beneficiary. Two years after the policy is purchased, it will pay out in the event of suicide. The man waits the required two years, and then kills himself, much to the dismay of his surviving relatives. The charity receives the money and saves the lives of many people who would otherwise have died.
Are the actions of this man admirable or shameful?