When you die, you go to the West :3 The Beautiful West. Towards the setting sun.
Most modern Kemetics don’t intend to be mummified. Some Kemetics dont’ even intend to have a body left to bury, honestly. It’s generally regarded that the ancients had lots and lots and lots of backup plans- they knew that mummification was not perfect (lots of mummies came out wrong) and that things often got destroyed or stolen from tombs. So they may backup plans in the form of statuary, relief work and things of that nature. In earlier forms of Egyptian burial practice, a Ka statue was more important than a mummy (Griffiths).
So for the modern era, you could have a picture of yourself for your Ka Statue stand-in. You are written in records (your birth certificate, your school files… the gov’t likely has lots of papers with your name on it), therefore- you’re not likely to just disappear. Unless the apocalypse happens tomorrow and all of our records are wiped out- you’ll have plenty of juju here to fuel your trip Westward. And from what I can gather, once you’ve got your paper work in order and you’ve made it through the Hall of Two Truths, you don’t necessarily need your mummy or anything else anymore to have a happy afterlife.
I think its also important to remember that not Kemetics subscribe to the many ideas of traditional Kemetic afterlife (which those ideas changed over the years). So I wouldn’t worry too much about that.
In my experience, what is most important is what is going on right here and now. We can’t control death or stop it from happening. But we can effect what we do while here on this planet. Once we die, whatever happens happens, and i don’t imagine the gods are gonna let you wander around in no-man’s-land once you’re dead just because you don’t have a mummy.