I love XT6s and ER27s, but no. Not at all worth the work to swap it in this day and age.
EJ22 is smaller, lighter, more reliable, more fuel efficient, better supported. ER27 ECU is mounted in the trunk, so you basically have to make a harness from scratch to swap it. Or spend the dough on a standalone.
They use a different bellhousing pattern, so if you change your mind, you will need a different transmission adapter.
If you want a 6-cylinder, get an EZ30. Modern, reliable, powerful. Don't mess with anything more than 20 years old (sorry EG33....getting to be a dinosaur as well).