You mean would actually work, since the hat itself can't see anything so Range: sight in the original is useless!
I botched a Magic Theory roll here - item amended as you suggested
I'd not really read through these before, thanks for the tip there are some cool options there- for this one though base 2 is the lowest, and increasing the level would push it a bit too high for an apprentice enchantment, but for an enhanced version you could make one that divides by Ewes, lambs, rams etc, which would just be an additional magnitude I believe.
I would not call it a House Rule.
Generally speaking, one can assume that for each Vim spell operating on a Realm, there is another operating on each of the other three Realms, barring specific limits of magic (e.g. you can't force demons to tell the truth, you cannot force the divine to do ... all sorts of stuff etc.). In this case, RoP:I provides the effect for demons; I think it's fair to assume there's a similar effect for magic spirits and another for faerie spirits.
If you are really unhappy with the description as such, you can always recast soulcatcher as demoncatcher.
Fetch for the Fairy Steed (ReHe 13)
R:Personal, D:Momentary,T:Individual
A Branch of Ash about the length of a young man's arm enchanted so that when a dog barks at it it flies of in a random direction. This item was created by a young Merinita apprentice to entertain his canine companion when he himself was busy.
However the item has for many years been locked in the archives of Irminsul after it was herded into the kitchens breaking a substantial amount of crockery and nearly knocking one of the cooks out.
I judge from the design line, the might score of faerie that can be protected against, and the item description that this shuold be target individual and duration sun. Rather than duration momentary and target vision as it says in the spell parameters line.
The redcap's impenetrable costume
This woollen clothing has an effect equivalent to Doublet of Impenetrable Silk enchanted into it, and is commonly purchased by House Mercere for redcaps. This is particularly useful for redcaps who may find themselves in trouble when they are least expecting it, but still wearing clothes.
(MuAn base 4, range personal +2 sun for level 10 +4 levels always on - total MuAn 14, takes 2 pawns of vis. The Jewelry/Clothing +4 protect self shape bonus applies)
The Rhine shield grog's coat
This wool coat can reshape itself into a comfortable bedroll on the uttering of a command word. Any similarity between this item and those German Army sleeping bags that could be worn as a jacket is purely intended.
(MuAn base 2, range personal + 1 concentration +2 for 3 uses/day +5 levels item maintains concentration for level 10 - only uses 1 pawn of vis!)