Halo 2 BR/SPNKR rocket launcher as starting weapon

is there a way i can make any of those weapons as starting weapon? i can’t
on starting weapons menu, i put any weapon i want, but not the SPNKR or H2 BR
is there a way i can put them?
Other than making a forge map or editing the map putting halo 2 BRs, i just want Halo 2 BR as starting weapon