Actually the heaviest part of the cartridge is the bullet. Now you plan to haul the bullets and reuse the cases... As suggested, small economy, weight or space... but it is your "haul..."
You need to try these things at home to make sure things "fit together", but should work. I got around to trying to use my RCBS primer crimp remover (on surplus cases) in the hand press and not enough clearance. -!!- Did that batch with my Rockchucker... I found another unit that has the case/shell holder on top of the press (CH??) worked fine in the hand press. As suggested, you don't want to "case form" out and about or home either IN A HAND PRESS... Unless you look like the Hulk already and need a work out... One fellow was telling me how he full length resized by stepping on his LEE hand press... Not for me...
Skeeter Skelton of Shooting Times fame, before his early death--poor old law dog, wrote of doing .38/.357's around the camp fire with Lyman 310 tools. Full length resizing with a 310 is not possible. They sell a separate die to full length that you beat the case into with a mallet and then take a rod and beat the case out. Lots of good lube, please... Work. But doesn't take up much space. 310, also, at one time were the only dies to "flare' the mouth of the case for lead bullet seating... Now the "M" die is available... Design dates from buffalo hunter days and cases of pure copper...
You should be able to use carbide dies and avoid this. (Carbide dies were not common once.)
And if you read the old timers, there are many versions of "dipping" powder. Skeeter and Naramore both wrote of making your own dipper out of used cases (long before the LEE plastic ones became available) and filing off to get the capacity you want. (You solder a wire handle on the side --well away from any powder!!!) With consistant pass thru the powder in open container, and scrape off... little practice and you will be amazed at how consistent you will be. Drop the charges into your scale and weigh them for practice. I cannot recommend this if you are loading to just short of the "hubs of H__" but for any less than max load... works real good.
.45/70 is not the stoutest of cases. You need to be a little gentle. With care, no problem. Any lead bullet load and most "moderate" jacketed bullet loads. Linebaugh was made from .348 WCF I think? Another lever action case. Not the brass of a belted magnum. Again. Moderation. Reasonable working loads should be no problem.
The other thought is "when."
If you are on the trail during daylight... Do you really want to do this at the end of a long day in the dark? By light of a campfire? Sure, there are lanterns today with the light of medium electric bulbs... You should be able to get it all into a .30 cal Army ammo can, if it suits your needs.
Wildest story I ever read... man was doing this in the Yukon. When Ideal made the 310 tools they had a bullet mold in the end of one handle, sometimes. Some metal melted out of the rocks into his camp fire... SO he used it to cast bullets for his lever gun. After several decades he was in town and someone noticed his bullets. They assayed one. GOLD! He had been shooting pure gold bullets for years... Wild story like this is probably true... LUCK....