How can I use it in combination with v1.1 (uploadMedia, etc.) ?

[fa0311]

Python

Use a combination of tweepy and tweepy_authlib.

example
https://github.com/fa0311/twitter_openapi_python/blob/master/example/sample/tweet_media.py

TypeScript

Use twitter-api-v2 and it plugins.

example
https://github.com/fa0311/twitter-openapi-typescript/blob/master/example/src/tweetMedia.ts

reference
fa0311/fa0311#1