Place tuna in bowl with poke dressing ingredients. Stir to combine, then set aside to marinate.
Add avocado, jalapeño, cilantro, and lime juice in separate bowl; season with salt and pepper; whisk until creamy.
Pat dry cucumber noodles, then add to avocado mixture and toss until coated in sauce.
Divide cucumber noodles among 3 bowls, and top with tuna poke, using a slotted spoon. Garnish with cilantro leaves and serve with lime wedges, if desired. *For Inspiralized spiralizer only (inspiralized.com)