Yes, actually. It isn't even that complicated nor does it need any epic spells, you just need the Book of Vile Darkness from 3.0, which has no errata/update for 3.5 - it might be difficult to get your DM to allow, but per official ruling it's legal for 3.5 games.
Find a 1-HD (yes, this matters) humanoid, cast True Domination on them, bring them somewhere secluded (likely your divine realm), and have them lie in place.
Cast Power Leech on them, choosing a stat other than Constitution - the reasoning for this is that they don't die when it hits 0. (Just in case, I will be assuming that you have to pick the drained stat at casting, and cannot change on the fly, but it does not specify).
Make the effect on them permanent, rest the required 10 minutes, then make the effect on yourself permanent. You don't need to rest just yet, no rest-required actions are needed from here on and you're allowed to delay it as long as you want as long, you just can't use any rest-required actions until it's been done.
Cast Greater Restoration on them, bringing their ability score back to its original value. You then continue draining where it left off, as while the spell can't drain from a score of 0, the spell didn't stop. Continue draining them dry and spamming Greater Restoration on them until satisfied.
As you do not need to eat, sleep, or breathe as a deity, this can go as long as you want, though you should try to keep them alive as well - figure out the spells to do so yourself.
Repeat steps 2-4 for each stat except Constitution.
If you wish to drain Constitution, you're a bit more limited - cast it with the Persistent Spell metamagic (which you can do with Alter Reality), which requires 6 rounds of rest instead of 600 (10 minutes). After finishing the rest, cast Greater Restoration on them, make your effect permanent, and proceed as above, being extra careful to be sure their Constitution never reaches 0.
Unfortunately, this has a limit of 24 hours, but that's exactly +14400 to Constitution. That's arbitrarily high enough.
Congrats, you now have as high stats as you're willing to sit there long enough for, with no epic spells nor any rule finagling necessary. Just Alter Reality.
Note: Unfortunately, your ultra-obscene stats do not protect you from Dispel Magic, which is able to cut all of these stats away permanently, nor does it apply in an antimagic field, but that applies to everything made permanent with Alter Reality. You'll need to find a way to either protect yourself from dispelling or kill the dispellers first with Hand of Death (no rest needed, but saving throw allowed which they can natural 20 to succeed on) or Life and Death (no saving throw but rest required).