Rebarreling a luger?

[Mr. 16 gauge]

Looking for everyone's thoughts/opinions on rebarreling my Luger...

I have a 1920's commercial model DWM Luger with 4" barrel....the problem is, it's chambered for the .30 Luger. .30 Luger ammo is difficult to come by, is expensive (over $1/rd), and only one domestic manufacturer makes it (Win), and who knows for how long.
I don't have any "safe queens"....the guns I have I like to shoot, hunt with, ect. I didn't pay a lot of money for this Luger, so I doubt it is a collectable one. I really would like to take it to the range more.
I have checked into reloading for it......no jacketed bullets available in it's prefered configuration (93 grain); cast bullets are difficult, if not impossible, to find; Lyman no longer makes a 93 grain mold for the caliber, and there isn't exactly a dearth of reloading data out there for the caliber. To gear up for reloading this caliber will take a fair chunk of change.
I currently have 2 handguns chambered in 9mm Luger, and I reload and cast for the caliber as well. I checked on a few sites, and there are 9mm luger barrels available. Here are my questions/concerns:

1.) while this gun appears to have no collector value now, I'm not sure about the near future.....If I have the gun rebarreled, but then later decide to have the old barrel put on, will it still decrease any collector value or will it remain intact?

2.) Any idea of the cost to do something like this (assuming I have the barrel already)?

Looking forward to any thoughts/input....thanks in advance.