[@DocRock]
The Haversack and the Bag of Beans really just give you the most (potential) bang for your buck and feature a lot of QoL stuff when needing a boat is not necessarily guaranteed despite [i]having[/i] a boat being awesome. A shockingly realistic drawback, actually. Anyway to get away from DnD since we're not DnD, imo it's totally for the better if you just take the concept of Artificer and act like you don't know much else about it; it's a very troubled class a lot of people would say in that it doesn't really... go anywhere as it grows. Hollow specializations, generalist identity as a third-caster with con saves, bunch of stuff.

As far as suggestions go, this isn't necessarily an attack but it is a more combative feature that might satisfy the GM's request. Since the character is an enchanter by nature you could say they work with magic on a very technical level and in doing so garner a more definitive understanding of what makes magic work- and not work, in certain circumstances. Not sure if it's appropriate to the thread but some manner of counter-magic or dispel feature would give your Saint Artificer more to do in combat that doesn't necessarily detract from their super utility focused identity.