5 lug rear axles

Kind of upgrading things a little at a time, I'm wanting to do the rear end and 5 lug conversion at the same time without upgrading to disc brakes for now. Looking at the Moser A883151 and A883151SN axles and it looks like the only difference is the SN disc axles have a larger hub centric. I'd really like to be able to use drums for now and convert to disc later without buying new axles again, has anyone machined out a drum to use on the SN flange axles? I'd wait and do the 5 lug conversion and big disc brakes all around with my suspension upgrades later but I'm really wanting to put new wheels on sooner without waiting for the budget to do everything.

Those are only 28 spline correct? I'm going 31 spline when I upgrade the diff so in the meantime need to also go 31 spline axle. Kind of the conundrum every one of these upgrades is connected in some way.

5L5 that looks like just the ticket, I was thinking some sort of spacer with the smaller axle would be better. I think I will end up waiting like SSP suggested, the wheels I want to run will have center cap issues if I temporarily run 5 lug Fox style front rotors. I will eventually have a MM tubular setup so would run the 96-04 spindles for the lower steering arm position- again, a problem unless I do it all at once. Thanks guys.