No it's not.. That's sorta the point with seasonal items.. Even once the season ends and you'll be able to get the shield on nonseason - it will never be an option to swap between stampede & condemn build based on rift - unless you wanna swap: bracers, Stone of Jordan, weapon, shield & any other item with elemental dmg on + ofcourse swap skills. Will just be way way too inefficient.
ONLYefficiant way of doing it would be to have a complete set of items for each spec. Condemn relies heavily on holy gear and items rolling condemn damage, and Stampede needs physical damage and stampede rolled items. Then ofc there are the differences in the builds regarding spells.
To be truely efficient you need two crusaders, one for Condemn, and one for Stampede. otherwise your going to spend a lot of gold and mats re-rolling the one set. and wasting time changing your build between rifts. where with two Saders, you can simply say "switching to my stampede character"
Definetly the best choice - Besides Stampede does have the weakness against wallers - however it's a very strong and efficient T6 build(and grift build - in terms of sader alternatives) so I'd strongly recommend going for upgrades for your Stampede-build and making it as efficient as possible