Josh Looking at your list of rifle/cartridges in the original post, you have most bases covered pretty well. But P&P’s idea isn’t bad returning to close to original, but I would go a little differently.
I like the 30-06 a lot. It’s a great and versatile cartridge. I only have 2 now but they are both favorites with different job descriptions. One is a Winchester Featherweight which sports a Bushnell 6500 Elite 2.5 x 16 scope which is my jacketed bullet 06. My second is a 03 Springfield made by Sedgely with a receiver sight and this is my cast bullet rifle.
Personally I wouldn’t return it to as close to original as possible because I prefer Sporterized rifles. If it was all original-original, that would be different. But you have the opportunity to build a great cast bullet machine. I would even give consideration to a 1 in 12 twist on a 22 to 26 inch barrel. My choice would be a standard to light barrel leaning more to a middle weight. Then scope it or receiver sight, your wallet is your only limit.
People now days put the 30-06 down as to mundane or not high tech or something else, but there’s no fly’s on the 06.
I once did a little reloading book research comparing to other cartridges like the 25-06. Great cartridge, 120 grains out at 3000 fps, 270 - 130 grains at 3100, 280 Remington 139 at 3000, compared to the old 30-06 launching a 150 grain bullet at 3000 fps. The 30-06 will do it all from 110 grains to 225 grains with B.C.’s 600 to 700.
Hunting bullets to 240 and if you have a dust old box of Colorado Custom Bullets at 250 grains. The verity is quite amazing.
For me my standard is the Hornady 190 grain InterLock BTSP which has worked well for me and If anything I still have a couple boxes of 220 gr RN Hornady and some 240’s by Woodleigh which are designed for the 30-06 in mind at 2400 fps.
So P Dogs to the big bears the 06 can and had done it all.
But, you know this already. I’m not telling you anything new.
The reason I’m all up over the 06 might be because I gave a Winchester model 54 - 30-06 to Dave up the hill about 40 years ago and it looks like I may get it back. If I do get my hands on it it will be my cast rifle with optics.