I think removing the contrived explanation that force ghosts are a new thing is a must in any edit. I can only assume that Lucas felt he had to explain it because he didn't spell out why Qui Gon left a body behind rather than disappear in the way established in the OT. Just like the force in general it didn't need explaining, yet he tried explaining that as well via Midichlorians. Urgh.

Your idea lends itself really well to making it an established fact that Jedi can do this, and always have.

The force glow effect can hide a lot (much like Adywan's new Emperor Hologram), so it MIGHT even be possible to utilize a shot of Qui Gon, standing relatively still, and manipulate the mouth. Then you can cobble together some dialogue from TPM, The Clone Wars series (which luckily already has the echoey modulation), and Liam Neeson's other body of work.

For me, it would have to be a slightly more mystical setting than a landing pad though ;)

One potential issue is that this deleted scene was only included on the DVD, not the Blu-Ray so resolution might be an issue.