If this cannot be configured and the job executes a script or stored procedure, then maybe do it programmatically.
Schedule the job to run each Tuesday and each Wednesday. The new job will include the following verification:
set datefirst 1
declare @now as date = GETDATE()
declare @day as int = datepart(day, @now)
declare @weekday as int = datepart(weekday, @now)
if (@weekday = 2 and @day <> 1) or (@weekday = 3 and @day = 2)
begin
perform the job...
end
If you cannot alter the original stored procedure, then maybe create a helper one that invokes the main one.