I understand the reservations about Texas, i.e. attitude, excessively self-serving, lust for organizational control, and it's vindictive behavior with Texas A&M, etc.
That noted, I view them as the #1 preferred prospect for SEC expansion if/when such happens. They check all the prime boxes and their value is fundamentally unmatched.
However, I am not in favor of pandering to them in extraordinary ways. Bringing along a bunch of coattail schools could divisively impact the SEC, not, perhaps, so distinctive from the results generated by the formation of the Big 12.
If added, let the LHN run its course until it expires. Financial accomodations can be negotiated.

Oklahoma is the other high value target. Here too, no coattail unless clearly desired by the SEC.

Even with ESPN media rights engaged, it is very doubtful any NC or VA ACC school will be in play or want to leave the ACC. I'd add Clemson to that. Their GoR would take a lot of votes to make any exceptions. To me personally, this is unrealistic and frustrating because I'd like to see NCSU or UNC (even Duke) in the SEC.

Again, I'd go for Texas first, and Oklahoma. . If one or the other isn't available, I suppose Kansas would offer some asset if reaching 16 is a 'must' immediately.
I'd take Texas-Oklahoma State if OU-Kansas were heading to the BIG.
Actually, the BIG12 and PAC12 could do something together and innovative, but either showing flexibility and profound willingness for major change doesn't appear to be a formidable option right now.
Heck, maybe nobody leaves the BIG12 in three or four years.