I would not do that.
I was a contented gasser-only for 20 years until I picked up the WSM 18 as a Covid hobby this spring.
Used the WSM as a grill as well as a smoker over the spring/summer/fall and really enjoyed it. Since the WSM isn't really that great as a grill, I'll probably add a grill to scratch the new itch for charcoal. Given all that, I was wondering if I might move on from the gasser.
Then the weather turned cold. I realized the gasser is probably the last grill I would let go of. It works fine during the warm months, but it simply can't be beat for speed and convenience during the bad weather months.
Keep the gasser, forget about the charcoal Summit, and add a Performer, kettle or Jumbo Joe to the portfolio. Any of which set you back less than $100 off CL/FBM. Then see what gets used/not used. Keep all three or sell the one that falls out of the rotation.
I'd only consider the Summit if I had (i) money to burn and (ii) a burning desire for a kamado. Seems like the Summit would be more likely to replace the WSM than the gasser.