AGFA/BASF/EMTEC SM468 was one of the tapes traditionally used on machines setup for 456. I set my machines for 456 and leave it there. I use Everything from Scotch 206 and Quantegy 406, to SM911 and SM468 without making any changes. Back in the day I also used Scotch 226, but that stuff has all gone sticky and I wouldn't touch it these days.
Some people, like Frank Zappa, even spliced 456 and 468 in together on the same reel. Gives you an idea how close they are in practice.
468 is not technically bias compatible, but in practice it works for most people except those who are really picky and will even rebias with each reel of tape, even the same brand and model tape.
The only truly bias compatible tape still being made is SM911. Back in the day we also had AGFA 469 and Scotch 226 that were made to be drop-in compatible with 456, but both of those are the worst for sticky shed now. SM468 or PEM 468 (
original AGFA model number) are all good.