It is perfectly fine to substitute the yarn with one strand of Jensen together with one strand of Alpaca 1 as a companion thread from Isager

speciellt med stora stickor då det tenderar att "växa"

there are suggestions for a neck edge in the instructions

Jensen + Silk Mohair: needles 5 = 16 sts / 20 rows

Isager Alpaca 3 - 59 Kalinka Garnkit It is perfectly fine toISAGER ALPACA 3 is a "tubespun" yarn that contains 50% wool and 50% alpaca. It is the same quality as Alpaca 2 but feels completely different because it is so airy, which is due to it being "tubespun." If you knit with 1 strand of Alpaca 3, it becomes a wonderfully light sweater even though the yarn is thick. The yarn works best when knitted with thick needles. Alpaca 3 is knitted on size 5 needles to get firm edges, but is otherwise best on size 6 or