The set of trades I proposed yielded the roster below. The salary of that team is ~186.157 million which while above the cap, is below the projected luxury tax line. And it would be fairly easy to drop that down even further and actually get below the cap next year if desired. Several of those contracts expire after next season, so cap room will be had by summer of 2027 regardless. Trading someone like Vassell or Brooks during the season for an expiring lower salary (and a draft pick) could maybe even get the team under the cap for 2026, or would certainly could free up a max level spot for 2027.
PG - Sheppard, Pritchard
SG - Vassell, Podz, Fontecchio
SF - Brooks, Hield, Scheireman
PF - Smith, Eason
C - Stewart, Tillman
10 + 28 + Tatum on IR + 36 (Stash or 2way)
dump Walsh or trade 28 for a future pick
The team then tanks next year and adds its own lottery pick to Sheppard and 10, and infuses the team with young high-level talent (not to mention Podz, Smith). Tatum then comes back and you still have some decent players around him, but have the young pieces needed to build a new championship core or trade for one (there were also other future 1st rounders allowing for a 1st heavy trade if one became available).
Obviously different trade packages could yield a similar result, but I just don't see this current team ever competing again with the same core. The age, health, and most importantly money just don't make it feasible in my view. Had Tatum not gotten hurt, it is a different discussion, but I believe his injury has ended this run.