Welcome to BYC! If you raise it together imo it should be fine. It's easier to raise chicks together than you will have better success than just shoving adults with chicks. Make sure they have plenty of room, food and water they will be friendlier. I'm raising different breeds of chickens together and even ducks with my flock. It's work (mainly ducks love to make water messes that I get to patch redirect or clean up) but it's doable. I have young cockerals that I will have to decide who to eat or rehome but in total I have 13. I have 4 EE, 3 silver laced wyandottes, 2 black australorp, 2 saphire olive egger, 1 barred rock (male) and 1 dominique (male). Plus meat birds (cornish x) and 5 ducks (1 khaki campbell and 4 pekin). They have 2 coops, extra large feeder, 1xl waterer (big bucket with the nipples), 2 gallon waters, 2 small chick ones (water is ducks favorite so I fill a lot of water), a mini pool that the ducks can dip in and clean their heads plus a smaller head size tub just for those head dips and for duck fish goodies to get out. I tend to spoil my feather babies. Even my meat birds are given gold star goodies. I'm a let them feel care and live their best life to respect them and well feel less guilty when I go and eat them. Vaccines are your choice. Some do, some don't. Some feed medicated starter others don't. It's all personal preference and what they have had done. Medicated feed will counteract the cocci vaccine. Do what makes YOU comfortable for vaccines.