I second that idea! Go to a Sally's, tell them your issue, and they can probably guide you through what you need to mix your own, or perhaps even a kit that would be comparable.

My college roommate did that (mixed her own color from things she bought at Sally's), and she was a double processes blonde! I would think straight hair color would be a lot easier than bleaching then highlighting DIY! There's hope for you! Lol! And that's not something that will get discontinued, either!
2c/3a/3b, Fine/med, Dense, high porous, & normal elas.

Lo-poo - Renpure Keratin, SMR, Giovanni SaS
clarifying - mix Johnson's H2T with low poo
Co-wash - Suave Nats. clar. or coco.
RO - GVPCB, Ion Eff. Care, TN.
LI - SMR, Cure Care, or RO
Seal - MO or Jojoba
DT - + honey, ACV, & EVOO to SM masque & GVPCB
PT - Gelatin!, CNPF
Styling - FSG, AIF, BRHG, LALS/PS, GF curl spray gel, SM Souffle/Smoothie, LOOB
Oils - MO!, EVOO, jojoba, GSO, SM Elixer, EVCO, VO5 Hairdressing