oyal Enfield is not the most comfortable bike to ride. Albeit its reputation as a tourer, TBTS is no exeption. The older version was much better but the current one is just another 150 cc bike. (I was being ironic). I feel that adding alloys will damage the comfort level further. This is because the spokes in the normal rim have more give. Hence they also act as shock absorbers in the long run and dampen that fall.
Further, alloy rims tend to crack if you drop them into potholes. The best example is Duke 390 whose alloys are more than happy to shatter on impact with potholes. A cracked rim is a serious concern on long rides. And while a bent rim can still be repaired atleast temporarily, a cracked rim is gone.
So I would definitely recommend against that mod. I would definitely love to have tubeless on my ride but not at the cost of compromised mile munching and reliability. Stick to your spoked rims. They are awsome!