Version 3.8.1 of the VRChat SDK will include the following feature:
Per-platform overrides allow you to configure different versions of your cross-platform avatar for multiple platforms. When you build & publish your avatar to more than one platform, the SDK automatically uploads different versions of your avatar to each selected platform under the same avatar ID.
Per-platform overrides make it easy to upload an optimized version of your avatar for Android and a fully featured version of your avatar for PC.