Yep, this is what you need to use, no inline filter is going to be able to remove chloramines in the time you need I to. A charcoal filer can improve taste but can't completely remove the chloramines.
The Carbon block I linked to is specifically designed to remove chloramines. Depending on how much you are talking about in your tap water. Personally I have less than 1ppm of chloramine in my tap water. (FAS DPD pool test kit can test for both Chlorine and Chloramine pretty precisely)
"Catalytic Activated" carbon is designed specifically to remove chloramines. IF you want, you could actually put this before the ChlorPlus block and have refillable catalytic activated carbon filter:
Carbon housing
BUT, I do agree with you, if you have like 5 ppm of Chloramine, then these carbon blocks won't remove ALL of it.
If you read the spec sheet on that block at a flow rate of 1 GPM it's good for 1,000 gallons and at .5 gpm it's good for 2,500 gallons (Those specs based on 3 ppm of chloramine)
Even at .5 GPM that's only 5 minutes to collect 10 gallons of brew water, not too bad.
I personally have the ChlorPlus block, but have it set up prior to my RO/DI system since the chloramines are not good for the RO membrane or the DI Resin. So I need to remove them BEFORE my filter system and the Campden won't work in this case for me.