Welcome to the forum! The first thing you need to fix is the constant regurgitation because that is not good for the bird for several reasons. The most important reason being that he needs to be overly hormonal to do that because birds that are not never do it - not even during breeding season.
Now, ekkies are very difficult birds to keep healthy and happy because they simply cannot eat the same food as any other parrot. Their diet in the wild is super specialized [VERY high in fiber and moisture and very low in protein and fat] so all the commercial diets out there are no good for them [and that's the reason why they all die so young]. It seems to me that this bird must have been free-fed either pellets or seeds/nuts which is, literally, poison to their liver and kidneys. They need lots and lots of produce and cooked whole grains. They are also the species of parrots that has the longest breeding season in the wild [up to nine months!] so keeping them at a super strict solar schedule with full exposure to dawn and dusk is essential as well as the special diet. So, the very first thing I would recommend you do is re-evaluate his diet and light schedule.
As to toys... well, I tell you, I don't have a whole lot of experience with this species because I only had one female and one male but what I can tell you is that neither played at all with any toys. They would much rather climb up and down branches, fly around, hang from things upside down from one foot and twirl their bodies around [I used to call the female: Gymnast Barbie
] and ride your shoulder than anything else.