I've done everything you have said except the grass seed and have had great rinks for the past six years... make sure you use a white tarp... and I always go with the snow route saves a ton of time and water not to mention is the easiest way to level... Never had any problems doing it that way.
Wait for a span with at least five days with -10 and colder then spray the snow in your frame until it is a heavy slush. Then I take a couple weighted 4x4s and get it as flat as possible... Heavy floods for a week or so with cold water, then hot water to level... Go out with a hatchet and bang out the bumps then flood with cold, next day with hot (light flood) and you are good to go.
Interested to hear how you make out...
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