Would the remaining Dem district in St. Louis be VRA protected? Because an 8-0 map is not exactly impossible if you can cut that remaining district, although it is not the safest of maps:
Also including 2016-Senate results because why not
MO-01: R+12 (Trump 59-36; Blunt 52-43)
MO-02: R+7 (Trump 56-39; Kander 47.6-47.3)
MO-03: R+6 (Trump 56-39; Kander 48-47.
MO-04: R+10 (Trump 56-38; Kander 48-47)
MO-05: R+7 (Trump 55-40; Blunt 48.1-47.9)
MO-06: R+6 (Trump 55-40; Kander 49-46)
MO-07: R+8 (Trump 57-38; Blunt 50-46)
MO-08: R+13 (Trump 60-35; Blunt 54-42)
So basically you get all 8 Trump districts with him winning by no less than 15 points. In a "perfect storm" like the 2016 Senate race the map does break, with 4 districts voting for Kander, though even there 4 districts end up in essencially statistical ties and are decided by less than 1 point.
Of course with trends and what not I imagine at least one of these districts would break?