Yes, this is the only way to build a blue line in this cap era, as shown by the five most recent cup winners:
Panthers had zero defensemen on ELCs in the playoffs. Regular season they got 26 games from Balinskis, so not an everyday player, much less a couple.
Vegas had zero defensemen on ELCs in the playoffs. Regular season they got 10 games from Korczak, so not an everyday player, much less a couple.
Avs got 30 regular season and 20 playoff games from Byram, so one ELC defenseman.
2021 Lightning had zero defensemen on ELC in the playoffs. Regular season they got 35 games from Cal Foote, so not an everyday player, much less a couple.
2020 Lightning had Cernak and Sergachev on ELC, so yes.