You may quickly find that adding the basic articles gets repetitious. 

Suppose your SEO text were as follows:

Fremont California in the East San Francisco Bay area is where in-person hypnosis sessions are held. Fremont is close to all of the East Bay Area. Fremont Central park makes a great hypnosis setting. Located in central Fremont California in the east bay area.

Fremont can be your home base for hypnotic vacations. Fremont East Bay California is from where your hypnotic journeys will start. Get hypnotized with me. Trance out near Fremont California.

Fremont is just across the Dumbarton bridge or San Mateo bridge. Fremont is close to everywhere.

You might find yourself saving the text in wordpad, replacing all references to "Fremont" with references to "Newark", adding the article, and then replacing the references to be to somewhere else.

There is no need to do this. You can use replacement patterns within the text.   Each article title becomes a replacement term. For example, if the above were an article in the "location" category with the title of "Fremont", you could use

{$location} California in the East San Francisco Bay area is where in-person hypnosis sessions are held. {$location} is close to all of the East Bay Area. {$location}Central park makes a great hypnosis setting. Located in central {$location} California in the east bay area.

{$location} can be your home base for hypnotic vacations. {$location}East Bay California is from where your hypnotic journeys will start. Get hypnotized with me. Trance out near {$location} California.

{$location} is just across the Dumbarton bridge or San Mateo bridge. {$location} is close to everywhere.

Now the same text can be used with each location.   All you have to do it copy it everywhere.

Note: Copied text might not be as good as individual text. The copied text might, for example, fail to mention something interesting about Newark and might not qualify for queries such as "hypnotist near Morton Salt".  Or text copied for "SAP Financials" might not at all fit "Sarbanes-Oxley Analyst". 

The "Watch the Magic" example, with this level of variables, becomes

Location/* : {$location} is a great place for hypnotherapy services. Visit me in {$location} for counseling.
Service/*: Offering {$service}. Try relaxing with {$service}.
Need/stress: Help your {$need}.