You probably can not withdraw any funds from the house on a reverse mortgage. First, you would have the same problem getting a reverse mortgage as with any other mortgage in that most lenders will not lend on a house with a life estate. You would also have to be over 62 years of age to qualify for a reverse mortgage. Best thing to do would be to have your father sign a new deed removing him from the life estate. If he is unable to do that then i suggest you consult with a real esate lawyer as the power of attorney may give you the power to remove him from the deed.
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The interest you own here is a contingent one. As of present, you only have a future interest. Ignoring the age requirements on a reverse mortgage, you will simply have problems withdrawing equity from something you do not currently have possessory or present interest in.