you just dont get as many clones out of the indica in the same amount of time. keep the top 4 nodes then use any lower branches that are big enough to make into clones. this also gives more space at the bottom which is nice for a few reasons.
if i did any more than 9 per light i would not top. topping with 9 per 1000 i can cover the light footprint a little better and by splitting my top bud into 4 smaller tops it lowers my chance of mold (kush loves to mold). no increase in yield as far as i can tell just functional. some of the smaller ones i dont top end up about the same size as the ones i do.
they could go to flower with 8hrs of dark or 10 but 12 will for sure do it. they could just be set back a few days by this or not. it will stress them but its hard to say what effects that stress will have on them. they will continue to veg once the light goes back.
you can grow a plant to finish, change the lighting back to veg, add grow nutes and after a while branches will start growing out of the buds.