As per subject I am looking for ways for my entirely noncaster character to gain arcane sight, preferably constantly. Only options I can come up with are a 60k custom item and exalted of nethys boon(doesn't work for rp reasons).
There's a 15k item that can do it and more:
Besides giving you arcane sight at will, it also makes it easier to fight incorporeal opponents.
Soulsight goggles are your answer. 15K cost. The below are cheaper but the goggles are what you're after.
Spoiler:
Runeward tattoos don't provide sight but they do at least warn you when spells are cast, and they're relatively cheap. A lantern of auras or a witchlight lantern don't do arcane sight, but they would at least provide a form factor for your custom item.