I like the idea of the 1-26 for both the 50 and 52cal. Its pretty much a Knight exclusive twist already in the 52cal. It should give a small edge in the 50cal too and be kind of a selling point.
The problem with a 1-20 45cal is
been there and done that. It bombed and many people wont forget even if it was just the marketing of a 155gr@2500fps that made it bomb, not the twist. Its fine for a 200gr or larger bullet, probably really good with a longer monolithic or even conicals. Even if just by a marketing view point the 1-24 would move away from that "bad ole" 1-20 that some wont forget. Even Cecil at PR still rags on the 1-20.
It will still give most of the advantages though and no one makes a 1-24 45cal so it would be another "exclusive". I wonder what a Lehigh 200gr would weigh in copper?