Dependency issues when PDF Services SDK is installed on AEM 6.5.21

Hi,

I am trying to install PDF Serivce SDK on AEM 6.5.21, for using Accessibility AutoTag API from PDF Services SDK (PDF Services API | Adobe PDF Services), and I can see a lot of dependency errors are below:

1. On installing PDF Services SDK 4.1.1 and 4.0.0, org.slj4j dependency is not being resolved as PDF service requires 2.0.9 above version and org.slj4j version available within AEM 6.5.21 is 

<dependency>

        <artifactId>slf4j-api</artifactId>

         <version>1.7.32</version>

         <groupId>org.slf4j</groupId>

         <scope>provided</scope>

</dependency> 

As there are many other bundles dependent on this version of org.slj4j, I am unable to change the version.

2. On trying to install a lower version of pdf Services SDK - 3.5.1, I get the below error:

On installing 

<dependency>
<groupId>com.nimbusds</groupId>
<artifactId>nimbus-jose-jwt</artifactId>
<version>9.35</version>
</dependency>

This indirectly dependents on the below :

AEM 6.5.21 uses a different version of com.google.gson and lesser than 2.10

AEM 6.5.21 uses this version :

Kindly help me understand which version of PDF Services sdk is compatible with AEM 6.5.21. Thank you. Appreciate any help on this.