Oh nice! We also did algebra and geometry at the same time...and actually that's one of the Common Core pathways (integrated pathway) for secondary math, as well as the way it's taught in a lot of other countries, outside of North America. (algebra I and algebra II, with geometry in parallel with both courses, completing all three in two years, vs all three in three years, in Common Core)
The Saxon-derived curricula mostly follow this too, through the 3rd edition. (Shormann is another Saxon-inspired curriculum.) Various Singapore-inspired curricula use the international sequence, and are in English (but British English, so watch out for some terminology differences--tripped us up a little on a placement test entering high school). There's also the Singapore version of ixl--I haven't used it, but it appears to have quite a bit of material a la Khan Academy.
And fwiw, I know a number of people who were on a similar schedule for secondary math. Or even earlier. Have fun!
