hot dang 308 to 35 rem, it can be done
 

I got a hair a few days back (when I looked for 35 rem brass on line, none to be had) and after a bit of reseach and my own idea's I got it..
1 use358 rcbs expander ball it works better than my lee
2 full length resize to 35 rem neck is long at this point
3using a 44 mag lyman sizer with the depriming rod removed and a shell holder that I've ground down to where it just has a lip left and run it all the way tight this removes the bump the 35 dies leave then with a drift pin or a 5/16th bolt drive the case out of the die
4 trim to length and then turn the neck down and then anneal
5 resize again.
time spent 1 hour for 20 pc
for the time being I've got brass so this is basically a can it be done thing but I know now I can do it if he need arises
I did not worry about the base of the brass as both my 35's are on bolt rifles, a tikka t3 and a savage axis

I don't think what you're doing is really feasible. The .308 has a larger case head by at least .013" which would cause problems with the chambering and extraction of the case.
Brass is available if you look.
https://nereloading.com/once%20fired...0shipping.html
https://gabrass.com/products/35-remington-fired-brass
https://www.armorally.com/shop/35-remington/

not that worried for my use as the case head is standard in both the axis and tikka, the lever actions might not work I do have a lyman resizing die that would riexize the case head but I don't need to go that far. As stated it's for can I if it ever gets to where I cant buy it. FyI all 3 links that you gave are out of stock

got up this am and went to do it again, and it just didn't work, but
1 run it threw my rcbs 44 die, using 243 brass, that neck would fit all the way in the die. 708 brass works to,
2 ran up the neck it 3 steps, annealled at 308 and then to 358
3 ran in the 35 rem dies
4 trimmed seems to work better, all rounds chamber

scratch all of this it works very well once then when I do it again the same way it doesn't, so probably a bad idea

https://saami.org/technical-informat...mber-drawings/

check your SAAMI dimensions its NEVER GOING TO WORK CORRECTLY