Not 100% sure this would work, but you could maybe give your class a "loadbang" method. Depending on how it's used with other objects, you might put the actual send in a clock with a delay of 0 so that it runs after your other loadbang initialization, for extra insurance.
So, if your class is graham_class...
In your graham_setup:
class_addmethod(graham_class, (t_method)graham_loadbang, gensym("loadbang"), 0);
In your graham_new:
x->x_clock = clock_new(x,(t_method)graham_wait);
In your graham_free:
clock_free(x->x_clock);
In your graham_loadbang:
clock_delay(x->x_clock, 0);