The word "no-brainer" springs to mind. If you ride wet, muddy roads in the cold, use fenders.
SKS race blades are suposed to fit racing bikes. Zip ties can solve a lot of mounting problems.
Ideally, you will get a winter training bike which has clearance and fittings for proper (SKS chromoplastic) fenders and winter tyres, and will save your nice raceday bike from abuse.