But that will only happen if there will be a RIPEMD160 collision.
And as you know it, its collision resistance is pretty "strong" at 280.
So, what is the practice way to find this collision? Is there any better way rather than straight brute force and luck?
There aren't any practical / faster way to find collusion, unless you managed to find vulnerability in both RIPEMD160 and SHA256 which can reduce the search space.