An alternative to this proposal would be for a small percentage of each block reward (or fees) to go into a pool that pays out the dust consolidation block, so miners are still paid something for this service.
How would you differentiate between 'genuine dust from legitimate users' and 'dust generated by tech-savvy users just for extraction of the dust-consolidation funds' ?
You cannot. Whatever metrics/heuristics you come up with for eligibility in the limit can be replicated by tech-savyy users.
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I don't understand what you mean. How can a "tech savvy" user "generate" dust without paying fees? The balance of every UTXO is already known, so someone can't (would be restricted from) use a UTXO above a dust threshold. That transaction would never be included in the special dist consolidation block, only regular blocks, and would therefore pay standard fees.
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