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Cleave is definitely more optimized while dual wielding, mostly because the skill itself is built around it. Also, if you plan on dual wielding two copies of Varunastra, you won't have to worry about gaps in your DPS between weapons since both weapons will essentially be the same.

Block is always helpful for melee builds. However, it doesn't seem like your tree is spec'd for it. The "Dervish" and "Blade Barrier" notable passives [as well as the nodes around them] come to mind when referring to dual wield-based block chance. Moreover, aside from life nodes, it appears that you're focused too much on offense. Redirecting some points towards nodes that provide life leech (e.g. the "Vitality Void" and "Hematophagy" notable passives) will give you some life recovery.

In regards to your ascendancy points, I suggest changing Inspirational to Worthy Foe. With it, enemies you taunt take 20% increased damage; this is multiplicative, as opposed to the 35% increased damage from Inspirational, which is additive. Furthermore, Worthy Foe is more party-friendly as it gives your teammates (as well as friendly minions and totems) 20% reduced damage taken (and that's from all hits - physical, elemental, spells, etc.) with 10% from taunt's general mechanic and another 10% from Worthy Foe.

Another thing to consider is that the Champion excels at increasing both armor and evasion rating. As such, you could focus on obtaining gear that is armor/evasion hybrid, or at least a good mixture of armor gear and evasion gear. Alternatively, you could try Iron Reflexes + Unwavering Stance to convert everything to armor; it'll defeat the purpose of Perseverance's armor/evasion mechanic, but it'll provide more flexibility in gearing options (as well as provide a considerable amount of armor if you use both Determination and Grace).

Overall, it seems like a decent idea.