The only way I believe it can work would be to slightly delay the invasion:

Jedi arrival, they look at the window, small talk, etc.
TC14 reports the ambassadors are Jedi
communication from the planet
the viceroy decides to invade the planet and he orders at the same time to kill the jedi
“captain look out”, dioxis scene, etc.

That way you have the invasion and the assassination attempt happening at the very same time. You’ll still have an opening faster than the original tha way, without the sitting and drinking tea being an issue.

edit: as a matter of fact, you just need to remove the “it’s an invasion army” cut scene to fix the main issues of your montage.