I had a Sailcraft Iroquois that had a big dent in the same postion but no crack. I monel riveted an aluminium patch over bonded down with Sikaflex, taking care to stagger the rivet holes. Its still going strong 15 years later.
The cross beam is just a strut that holds the two bows apart and should not take any bending load. The rigging
load is taken by the seagull striker stay of which the vertical component is taken by the 2 bows and the horizontal component tries to compress the cross beam.
I would be unconcerned about the beam failing and would probably get the crack welded up as mentioned and then address the cosmetics by covering it and the opposite side with patches. Now I would get 2 pieces aluminium formed to the exact curve, anodised the same colour and stuck down with Sikaflex or similar. Take photos, as when you come to sell the boat the puchaser or his surveyor
should spot it and want reassurance.