How can I choose from a library of FBX T-pose models and separate FBX motions and combine them on the fly e.g with an API

Development Character & Animation
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1

Hi
I have a gallery of FBX t-pose models
also a gallery of FBX motions
I can of course load and combine these in the software.
Can i use a feature outside for main software which can be run from e.g. an API or basic tool in a webframe that can accept 2 FBX files (model and motion) and return a combined file on the fly, or, a way of just “running” the output with these two inputs which renders in real time?