From my understanding you need both range and detect chance, so the accessory needs both the Offense and Defense Effects on a accessory, and how much you get from potions is limited anyway.
So you would need to make a weapon that stacks those effects to make it into an essence or find an accessory that already has that effect stacked.
You are honestly better off using the Defense Charm that protects you from traps automatically.
That's how the Forbidden Blade is intended for but that costs Erosion.
You can generally remake a decent weapon with materials on the map, it's good to have a heroine weapon material on hand to have something reliable.
Where you get screwed with crafting is with the amount of enchantments and if you want to craft a specific weapon, that is best done at the base with materials you collect.
The problem with not being able to craft weapons reliably is that you keep losing the Skill Levels and the good Enchantment Effects.
Really half of the issues people have with the grind in the game could be solved if they just gave you +20 more additional Storage Slots initially.
Re: Defense charm:
True. But it's really not reliable to get defense charms compared to true sight pot, and they run out super fast.
Re: forbidden blade
No, that's not even close. Forbidden blade skills can barely cover half a room, it's for clearing your immediate vicinity (and it's not that much better than repulsion stone). It does basically nothing on a distortion map, for example, whereas the judgement scrolls in Maidensnow can hit an entire corner (aka most of the enemies on the map), and spamming 2-3 of them basically kills any amount of anything.
re: decent weapon
It's a lot better if you're actually racking up the perma-boost souls, but i haven't done enough runs for that. I also don't really bother with enchant effects beyond 'deal more damage' because big number makes brain feel good (though i do understand that getting stuff like sleep%, stun%, kb% especially are strong). I also like hoarding my best weapons and feel kinda shitty using nukes on normal enemies, though now i have shanoa i should probably be less of a stickler considering i've stockpiled like 10 weapons in the chest and carry another 5.
re: initial storage slots
Generally yeah, would help a ton, though there is the “fun” part that for true hoarders, no amount of inventory space is enough (see the above).