1968/1971 steering wheel swap possible?

Not necessarily. I believe a wheel with the half horn ring your looking for that fits the wider key locking column was also used in 1970 B body cars. It's a bit of a needle in a haystack find as it would be 1 year only, but it will fit your 71.

Yes, I agree but '70 B-body steering wheels have a padded horn ring. It's not so sexy that the chromed 67-68 wheels.
And as you say : it's like finding a needle in a haystack...or pricey :eek: :
https://www.ebay.com/itm/1970-Mopar...410574?hash=item46ab58704e:g:MJYAAOSwUvBeeXiw