so you just need a race bike,? actually have the commuter part covered,
or the current bike will become the commuter..

Trek PDX for example is only $600 and has disc brakes , apparently chump-change.
and ready to take proper mudguards and a rear rack

Screw up the race bike on the commute,
and you are just a spectator at the races.

how about 2 matching lesser bikes for the same amount, ?

the teams Bike cleaner will hose one off and then you go faster on muddy courses.

that's how many people win these days.. bike changes mid race.