You can use the same paragraph format both for ALink keywords and to produce a button for an ALink jump in HTML Help. Use configuration settings and DITA2Go macros to capture content and create a list of keywords for a topic, then use additional macros to build an ALink button for the topic.
With this technique you can even include multiple keywords in a single paragraph. The only restriction is that ALink keyword paragraphs must precede the location in each topic where you want the ALink jump to appear.
§18.7.5.1 Creating a list of ALink keywords from paragraphs
§18.7.5.2 Initializing the ALink keyword list counter
§18.7.5.3 Building an ALink button object from an ALink keyword list
§18.7.5.4 Positioning the ALink button in each HTML Help topic
§18.7.5.5 Including multiple ALink keywords in a paragraph or marker