Pants and belts were added in one go - much more than 33 items.
When the level cap was increased and new items were added - again we're talking about hundreds of items.
Change of level requirements (remember when you woke up one day, you had a hat equipped and if you removed it you could not equip it again because they increased the minimum level needed to wear it?) was done in one update for hundreds of items.
I don't think that there is any technical restriction that would prevent them from doing it for all shop items at once. Even if they do it category by category it would be acceptable. Hats, scarves, shoes, shirts, belts, pants, dueling weapons, fort weapons (or maybe they stay the same? no skills attributes from them now). Animals stay as they are, there are no saddles/products in the shop = 7 or 8 updates and we're done.
If they don't know which numbers to apply - ask the player community for suggestions. Make a competition out of it...