I can't say with 100% certainty as I have not tried it, but .25-35 Winchester dies should work for .25 Rem. Dimensionally, and aside from the fact that the .25 Rem is rimless, the two cases are very close. There is a difference in the shoulder angle, with the .25-35 being shallower. Therefore, to resize a fired .25 Rem case in the .25-35 FL die, start by backing off the FL die base a few hundredths from the shell holder to preserve the .25 Rem shoulder angle. Do this by trial and error, starting with maybe a 0.10" gap, closing in gradually after that, and checking chamber fit in your barrel as you go, i.e., put a resized case in the chamber and close the bolt on it to see that the bolt closes completely and the rim has locked under the extractor, and that the case can be extracted. Stop and set the die position when that happens. There will be no problem in using the .25-35 seating die. What you are doing is using the .25-35 die to neck size and also to partially body size, but the results should be fine.
I have always used .30-30 Win dies to reload .30 Rem brass in exactly the same way, and it works perfectly.
If you wish to make up .25 Rem cases, you can try sizing .30 Rem necks down using the same procedure, using the .25-35 FL die. You can buy new .30 Rem cases reasonably at Reed's in Oklahoma City, see their website. Again, I have not done this myself, but it should work. Just make sure the neck diameter is resized for the full neck length.
Always check and trim case length if necessary. The correct .25 Rem case length is 2.04" but a few hundredths shorter is OK.
Please make another posting with your results.
PS: In all of my full-length resizing and case forming, I have had consistently good results using STP motor oil additive as a lubricant. Just don't apply it heavily - I just rub on with my fingers, making sure to cover the neck and shoulder area. Lube inside the case neck with powdered graphite.