For the freeze damaged one, do exactly what you are doing. Water VERY sparingly so the roots do not turn to a mush mess. Leave the dead leaves on too. In a few months, when the bulbs start to send out new growths, you can trim off the dead leaves. Some may fall off and save you the task!
Wait until the new growths are up about 2-3" from the bulbs without leaves. Do not divide it. It will take several years for this plant to recover, but recover it will if the current bulbs are still firm.
Do not repot the other plant until the weather warms up. If it is not in stress now, enjoy the blooms. If it is in stress, remove the spike to enjoy as a cut and let the plant recover until spring.
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