If you're reluctant to spend the extra poetics, keep in mind that, unless you're sitting at ARR level cap... actually, no, wait, base game level cap is now 60 anyway. So, it won't be all that long before Ironworks, augmented or not, gets replaced. Stat-wise, you likely won't be noticeably suffering.

But yes, bit of an oversight to have not offered a trade-in same as Shire and Scaeven.