RecipesBase: How to define the same recipe for different packages?

Specific Domains Visualization
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For future reference, based on @mkborregaard’s comment, I found a better solution that involves wrapping SolutionUsingAlgorithmB and SolutionUsingAlgorithmC inside a constructor _Convergence defined in A:

module A
  ...
  struct _Convergence{solution_T}
    solution::solution_T
  end
  @userplot CONVERGENCE
  @recipe function f(h::CONVERGENCE)
    return _Convergence(h.args[1])
  end
end

module B
  using A
  ...
  @recipe function f(wrappedobject::NSDEBase._Convergence{<:SolutionUsingAlgorithmB})
    solution = wrappedobject.solution
    ...
  end
end

and similarly for C. This solution has the non-trivial advantage of allowing for the usage of the usual RecipesBase tricks (for loops of @series, etc) inside the relevant recipes defined in B and C, which otherwise couldn’t be used (that easily) with the previous approach based on _convergence.