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1 - No, it is not doable. Mythic Tiers (for class levels, where you pick a path), and Mythic Ranks (which are what mythic monsters have, and are unrestricted as far as what path abilities you can choose) are incompatible according to the rules. If a creature with a mythic tier becomes a mythic monster (for example, by acquiring the Mythic Vampire template), they lose the tiers and gain the ranks.
2 & 3 - There is no listed relationship between HD and Mythic Rank. Instead there is a general case that Mythic versions of the monsters have a rank about 1/2 of their non-mythic CR. Adding HD therefore doesn't increase rank. You're suggestion to have an adjustment to do that is probably the best solution, so I'll try and get that in for the next release if possible.
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