With the kickeroo it's best to give it when they are going crazy so you just throw it down when they are in their play frenzy mode otherwise normally they don't have much interest in it. Also spraying everything with catnip can really help.
My two love feather toys and my girl loves anything that makes a jingle noise and jingle balls, we have a little track with light up balls in that I play with with them and they will just push the balls around. Every Bengal is different and some love some toys and others don't, also my old girl and my little boy love catnip mice.
When playing usually what interests them in trying to make it seem more like a hunt and they are stalking prey. Move the toy slowly at first until they are internested and then get it moving faster. Another toy that I found my two really liked was the one like a butterfly (maybe because my boy loves chasing and eating bugs) and then when playtime is over I just throw down the kickeroo so they can attack that instead of the toy. Also the catdancer toy works in a similar way and moves like a butterfly.
I have found that catnip sprays can help if he likes catnip. If they are getting bored watch him and see what he likes to do and try and mimic it within play. Some like chasing mice, some prefer birds others insects or even fish and just work with that. Does he like watching birds through the windows? Does he like to catch bugs or lizards? Do you have fish does he like watching fish (my previous Bengal was obsessed with an old aquarium we had) My two also adore water and I've found that giving them a washing up bowl or mini cat pool with some water in gets them to play for hours.
With bengals when they play together you will find they have very particular habits they like to take turns chasing each other and flipping each other around, one will sometimes go and hide and then pop out of nowhere on the other one and then jump on them and roll around wrestling. I can't help but feel what he's doing is trying to reinact how he would play with another Bengal with you. My previous girl who was an only Bengal often liked to play tag and chase with me in the garden she would hide in the bushes and jump out tap me on the leg and then rush off.
If you can't find any toys that will help or that he's interested in maybe the best solution is to clip the ends off his claws and ignore him when he does it. He does seem to be acting like he wants another cat to play with rather than actual hunting behaviours.
If he loves the wand toys try making it go up and down his cat trees or maybe up and down a flight of stairs and get him to rush after it, also that would tire him out faster so it would be easier on you and your poor arms. Then at the end of playtime you throw him the kickeroo or one of his favourite toys and he catches that. If he loves wand toys I really recommend the da butterflier as well as the da bird (which I think everyone with a Bengal owner swears by) my girl also loves the da mouse. If you are still having issues and are willing to take him outside you could look into getting a custom made cat harness for him and take him out for a walk around your garden.
I think there's a thread on here somewhere with toy recommendations but see if you have any of these I've found these are the toys my two love and I can play with them.
Da bird
https://www.amazon.com/gp/aw/d/B000F9JJ ... ref=plSrchDa butterflier
https://www.amazon.com/Go-Cat-Butterfli ... B001C6BZ8CDa mouse
https://www.amazon.com/gp/aw/d/B000LPOU ... B001C6BZ8CCatit track
https://www.amazon.com/gp/aw/d/B00A4A7U ... SX200_QL40Catit play and scratch (my two really adore this one)
https://www.amazon.com/gp/aw/d/B00GA096 ... +scratcherCat tunnel
https://www.amazon.com/gp/aw/d/B0024EAC ... ref=plSrchCatdancer
https://www.amazon.com/gp/aw/d/B0006N9I ... h-keywordsKong figure of eight track
https://www.amazon.com/gp/aw/d/B00BJZ5D ... kong+trackFor treats the only ones my two love are Thrive which are a UK brand of freeze dried pure meat treats. I would think if you look you may be able to find your countries equivalent of freeze dried chicken treats which are just chunks of freeze dried chicken and they usually go nuts for them other commercial treats don't go down as well.
Arya really loves her Da mouse lol