I don’t know if you have tried Typora, which is the model/target for how Obsidian’s Live Preview will work. What doesn’t work for you in Typora? It’s just markdown below, easily read and edited by Obsidian.
Can copy formatted text and a table in Word, and it reproduces faultlessly when pasted in Typora.
Typora is no longer free (it’s $14.99), but you can get 15 days free trial to test it out.