Go with the guitar solo over the bridge. Being tuned down to 435hz is going to put any harmonic that isn’t specialy tuned out. Harmonica tunings fall into the 442-443hz range (the act of playing a harmonica causes the pitch to drop into the 440 range). Unless you want to tune a harmonica down to where you are, it won’t work. A minor tuned harmonica would be the way to go if you weren’t tuned down, either an Abmin (first position) or a Dbmin (second position). A chromatic is another alternative, but again, you would have to tune to 440hz. You can try what a guitarist I worked with would do, tune down a full step and play up.
It really fattened up the groove, and my harmonicas didn’t need to be re-tuned.