Just my opinion, but REALLY...take the time to learn how to set up your bridge, saddle, intonation, string changes and minor nut adjustments. You will be SO happy you did! You will save yourself a lot of time and money, be able to change things immediately, experiment with different strings, bridges, etc...and NOT be at the mercy of someone else's schedule. And it's not difficult!
I have installed TOMs on all my archtops...Gretsch's mostly, and love them! I'm going to do it on my X160 Rockabilly too! That way I can adjust for plain G or wound G strings.
Here's the deal, you need to have adequate string break angle behind the bridge for proper intonation, playability, stability and Bigsby usage. On some guitars, their geometry doesn't allow for it, so Bigsby came up with the tension bar model that you see on many guitars. It works fine...a little stiffer than the original, but it does give the benefit of increased sustain and keeps the floating bridge anchored, and keeps the strings from popping out of the saddles under hard playing!
MY X160 Rockabilly was made in Corona. It came with a Bigsby bridge and saddle as well (compensated for a plain G...which is why I had to do a lot of research...its all documented here on another thread, so I won't rehash it all here). Guild/Fender at Corona changed the neck angle from the previous X160 Westerly-made (and as a result, had to use spacers under the pickups to keep the pickups relatively close to the strings.) That way they could raise the bridge to increase the bridge break angle. GREAT idea! Works wonders! Keeps the action nice and low and still has nice break angle after the bridge.
However, the design of the Bigsby saddle is just plain weird. The bottom is somewhat rounded, supposed to help with vibrato usage...so it's designed to rock on the thumb-wheels on the posts...and uses shorter mounting poles to facilitate the rocking motion. The problem is, there's no "zero" to return to, so tuning is not stable. AND...if you play too hard, you knock the saddle off the short posts!
I found taller mounting screws online and modified them to work and it really helps stabilize the bridge and tuning. But, with the Bigsby saddle, I'm stuck with plain G string intonation. It's not horrible, but it's not exact. So, I'll be changing to a TOM.
BUT...and here's the big butt...not all TOMs are created equal! I only use ABR-1. Their quality is consistent! Too many of the knock-off ones are just not good...they rattle, you lose sustain, they're just not good quality. So be careful.
AND...with a TOM you are free to change string gauges at whim and intonate the guitar to your heart's content! And that's why you should learn to do it yourself!
Just my opinion...but going from a TOM (a REAL TOM) to a Bigsby is going backwards!