Vikena,
Not too sure where the tailwind thoughts came into the equation ?
What my good colleague OS is suggesting (in a detailed way) is that it's "not quite that simple".
The gameplan still requires that the escape procedure has to meet whatever operational airworthiness requirements exist for your AOC. If this can be done with regard to the SID procedure, then that is fine. However, it is not just a matter of making sure that the gradient is OK (presuming that you can push the third segment above the limiting obstacle). One needs to ensure, for instance, that the turning points, turn radii, GFP/NFP, wind drift, trapezoid clearance .. numbers fit with the SID.
What I would suggest is to do what some ops engineers do .. check the SID as an escape using the normal OEI sums and procedures and declare whatever weight limitations etc., might be appropriate for such an escape.
In the majority of cases, it is quite unreasonable to expect the pilot to make escape assessments at the time .. they need to be done in a fairly rigorous engineering analysis approach... one needs to keep in mind that the analysis might need to be defended at a judicial enquiry after the incident/accident ...