Looking for mudguards to fit a beam bike.

For winter group rides, the local club require full length mudguards. My road bike is an old, but much loved, Titanflex beam bike and I've not found any guards that will fit. I think I'd be able to fit the Raceblade Pro XL but still don't think they'll provide enough coverage. Does anyone know of any others that might be worth trying?

Otherwise, I'll have to park it on the turbo for the winter and take the gravel bike instead.