You certainly are not being ridiculous, I also hate Sprite water! I would say a majority of people don't do it that way, but some do. And of those who do, haven't reported anything negative. That said, these are reports from my general readings, through various forums and such, and I'm not digging for updates on there progress. Keep that in mind.
You mention not wanting to do a DIY reactor, I understand that for sure. The tubing is so different from other filters! But know you could use different tubing that will work with DIY reactors. Alternatively, you could use an inline pump to connect a DIY reactor or preassembled reactor in it's own loop. It would add a second intake and output, but maybe offer you a solution.
I use these pumps and they have worked well so far. SICCE Syncra Silent 1.0 Multi-Purpose Pump, designed for freshwater and saltwater https://www.amazon.com/dp/B004ZJDN5Q/ref=cm_sw_r_apan_glt_i_QHFN0G06YS3SKRJBVWGR?psc=1
May I ask what size tubing the FX has?