I thought i should come in and finish this thread off.
I did end up picking up that 457 Varmint in left handed with the 22LR barrel on it.
At the time of purchase I was also able to pick up a 22mag miniset from the same store.
Here is where the waters get muddy.
I ordered the 17HMR miniset at the same time, unfortunately and not the gun stores problem, CZ kinda stopped making/shipping minisets for some reason.
So I waited 18 months and randomly last week I did a google search and a gun store out east had the exact miniset i needed in stock.
Cancelled the 18 month special order and purchased the in stock miniset.
It arrived 2 days ago.
So I now have a gorgeous 457 Varmint that is a left hand shooter in 22LR and a brand new in the boxes miniset conversions for 22mag and 17HMR.
While I know ill never swap out those barrels, 50 years from now someone may want to and that option will be there for them to be able too.
Never imagined it would take 18 months to finish this project but sometimes getting parts just sucks!