Last view id is 1864 but could be more. (https://github.com/zackdreaver/ROenglishRE/blob/master/Ragnarok/data/luafiles514/lua files/datainfo/accessoryid.lub)
Maybe start at 2200 to allow for new sprites. I have had some issues with view ids above 3000. Maybe it was 4000, I forgot. I just remember once I got to a certain point, the client would just crash.