Each dollar diverted to chase nuke wills-o'-th'-wisp brings climate catastrophe nearer.
Money is fungible. Dropping $billions on this means not dropping those $billions on something that works already, works fantastically well, and would work even better with more money. We already know how to prevent (more) climate catastrophe. We just need to do more of it.
Fission means, in practice, paying enough for coal generation, over the decade, to have built enough solar to displace the nuke; and paying many times that, on top, to build the nuke.
So, no. Each dollar diverted from building out solar to mining coal or fooling with nukes brings existential catastrophe nearer.
Money is fungible. Dropping $billions on this means not dropping those $billions on something that works already, works fantastically well, and would work even better with more money. We already know how to prevent (more) climate catastrophe. We just need to do more of it.