HQ and sodium or potassium sulfite will make what you want with the addition of the right amount of oxidant. You should read up on the synthesis in a good text though. I don't have the information here.
As I noted earlier, Kyanted has special ordered a number of chemicals for me, as has the Formulary. You just need to ask. Kyantec does not list Erythrosine, but I buy it there. They special order it for me.