I don't know on the Den, but the quickest way to kill your phal is to leave it in standing water. If the pot doesn't have drainage, I think I'd risk repotting. Since your phal could stay in bloom for months, I think it would be better to repot it now, rather than loose both the blooms and the plant. Although repotting while they are in bloom isn't ideal, your plant, including the blooms will probably survive. After you repot, keep all the other conditions stable (light, water etc) so that it doesn't have additional shock.