How to get SlingScriptHelper in servlet?

I need to get a SlingScriptHelper instance from within my servlet. Either a ComponentContext or BundleContext will do as well, as my only goal is to get sling services using it.
Using SCR @Reference injection is not a solution for me, because I will determine at runtime what service class I need to get.
I've seen posts online that use an activate() method to get ComponentContext, and also decompiled some class that do it, but don't know how to cause sling to call this method and set my ComponentContext
I've tried pulling it from the Request scope as an attribute, but sling apparently only puts it there for scripts, not servlets.
I've tried injecting all of these objects themselves - none can be injected.
Any help? I'm hoping there's some static factory I can just hit and get one of these objects so that I can get services...

I think there's some confusion here, probably because there are two different types of servlets used in Sling. The first, and far more common, is servlets which are registered as OSGi services. For these, there is no SlingBindings object available because these aren't scripts. They are, however, OSGi services, so by definition you have access to the BundleContext. If you're using DS, it is available via the ComponentContext passed to the component's activate() method. From this BundleContext, you can look up whatever services you want with filters, etc.
The second type is when Java is used as a scripting language. In this case, the SlingBindings object is available as a request attribute. You can also have the SlingScriptHelper object injected into these services using @Inject. See https://issues.apache.org/jira/browse/SLING-2237.
In neither case should FrameworkUtil be used.
If there are cases where Java is used as a scripting language AND SlingBindings isn't available as a request object, please file bugs about those cases with steps to reproduce.
It sounds like the biggest confusion is that there's a perception that DS components can only have service references injected into them. This is completely wrong. While injection is preferable, it is by no means required.

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