Relative path to .sty theme - nested {color,inner,outer} theme files

I’ve been working through the detailed answer to this question: Design a custom Beamer theme from scratch and have a question regarding paths.

I’m building a theme to be used in multiple presentations. I have a directory structure (git repo) as follows:

|- Presentations (top-dir)
|
|_.git (and subfolders)
|
|_Presentation1
|  |-presentation1.tex
|  -presentation1.{aux,pdf} etc
|
|_Presentation2
|  |-presentation2.tex
|  -presentation2.{aux,pdf} etc
|
_Theme
   |-beamerthememytheme.sty
   |-beamerinnerthememytheme.sty
   |-beamerouterthememytheme.sty
   -beamercolorthememytheme.sty

I seem to have a few options to use this theme:

• Symbolically link all 4 files into each presentation. Adds to setup cost, can complicate handling with git, but works nicely and doesn’t require peculiar handling in the theme files

• Abandon usetheme{mytheme} and use usepackage{../Theme/beamerthememytheme} in the presentationN.tex file. This also works for the main .tex file, but seems to require that my theme file now reads usepackage{../Theme/beamerinnerthememytheme} instead of the simpler useinnertheme{mytheme}

• Remove extra files. Use only beamerthememytheme.sty and copy the contents of {inner,outer,color} themes into that file. I can also rename to make this simpler by removing the leading beamertheme label, since I have to use usepackage anyway. This seems undesirable for readability/maintainability, but I suppose is a tradeoff if the alternatives are complicated.

Is there any way to specify from a .sty file the part that it is included with? In my case, I would imagine I could then go ahead and include <unknown-inclusion-relative-path>/beamerinnerthememytheme without concern that I might have presentations want to include this from outside of this directory structure (not a major problem, but would be nice to avoid limiting possibilities whilst I still have ability to easily change).