After thinking through the comments and conversing with one of our other admins, I decided to change the intermediate forwarder to a UF install. (We will always route data based on the host field, so the HF would've been overkill. Plus, I had some concerns about the parsing/indexing load on HFs that were built to be only very lightweight.)
After adding a stanza in props.conf to look for splunk-if by IP and pointing it to the splunk-if stanza in transforms.conf (all on the indexer), I now have that data set routing into the desired alternate index.
I still have a few other things on the To Do list before building the production servers, but this has helped me tremendously. Thanks for your help in getting me through this stage.
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