more dark blonde to brown lol colour fillers?

hi guys, i had blonde highlights a couple of months ago and hated them so had a warm brown permanent put over the blonde (which turned out very red) but has now faded back to a light brown/with some kinda golden blonde streaks.

Im going to go dark brown with redken eq shades in a couple of weeks.

Does anyone know of any professional colour fillers i could use (instead of having to fill with red?)

Im thinking i will mix a dark brown red with a dark brown neutral of the eq shades, so the colour will have abit of red in it just not alot (it went so red last time lol) but i do think i will need to colour fill just in case (really dont want green hair!).