Heat and Run
https://www.mangago.me/read-manga/the_alpha_s_bride/
https://www.mangago.me/read-manga/struggle_1/
https://www.mangago.me/read-manga/kyou_kara_omega_ni_narimashita/
https://www.mangago.me/read-manga/kami_sama_wa_chotto_dake_ijiwaru/
https://www.mangago.me/read-manga/peach_musk/
Forced change (ML knowingly does something to force MC’s designation to change):
https://www.mangago.me/read-manga/pheromone_baby/
https://www.mangago.me/read-manga/falling_alpha_enigma_the_fourth_bath/
https://www.mangago.me/read-manga/unfinished_relationship/
https://www.mangago.me/read-manga/imitation_mate/
https://www.mangago.me/read-manga/raising_beta_winnow/
I would love to read an Omegaverse where their designation isn't what they originally thought, where they THOUGHT they were a Beta but then it changes?
Like and Alpha and Beta, but the beta turns out to be Omega?
Or an Omega and Beta and the beta turns out to be alpha?
Like an incorrect designation at first?
I have no idea how to even seach for this trope lol