By this you mean the Olympic lifts themselves or you're actually meaning any kind of strength-speed exercise? If so, then you could substitute the O-lifts with jump squats and get the same if not more.
You could bridge that gap with jump squats and depth jumps.
You could do that but....
1) Jump squats are a little bit harder to scale. Unless you have a specific height that you are jumping to, how do you know when you are progressing? Does it really mean anything if you claim "I added 50 pounds to my jump squat!". But adding 50 pounds to your hang snatch certainly does. Also, how long can you add weight? Is it safe to do jump squats with 75% of your squat max? It's safe to do oly lifts with as much weight as you can!
If we are gonna deal with just the archetype steven brought up (ie. last kid picked in PE class, lets call him X), you could also argue that he wouldn't necessarily learn to express his strength better through a jump squat. Remember, X is someone who can add weight to his squat without increasing his standing vertical jump. When, he puts a bar on his back and jumps how do we know he will won't be super slow and jump poorly? The advantage to olympic lifts is once they weight is moderate you absolutely CANNOT do any part of the pull slowly because you are not strong enough to hold the bar in space unless it's been accelerated already. This isn't provided by jump squats. X could squat to parallel and slowly ascend until almost standing and then when almost standing accelerate without any hip drive whatsoever and jump. I recognize this argument is kind of silly because the person X I am describing right now sounds so poorly coordinated that he probably won't learn olympic lifts either and maybe would actually be best suited to do some type of long GPP program with bounding, jumping, stretching, etc so he can use his body before he does anymore strength training...
The thing is - should you struggle with hang cleans and hang snatches (if you learn them by yourself etc) or should you just go with jump squats and that's it?
That's the real question! I would say it depends on a three things, why you struggle with them, how much you hate struggling with them, and how well you express your strength.
Do you have a video of yourself struggling with them?
Whats your olympic style squat max vs your hang clean and snatch PRs?
Is your vertical jump at all tied to your squat/bw ratio?
When you struggle with them does that means your form is decent but your wrists and shoulders hurt because of the rack position for clean and that's annoying?
Do you use straps for snatch and chalk for cleans?
Do you not mind working at them or do you absolutely hate oly lifts and just do them because you think you need to to jump?
Are you 1-footed or two foot jumper, whats your max deadlift?
Do you do full lifts or lifts from the hang or power-versions?
Do you do overhead squats and front squats?
Is your upper-body weak, ie pullups, bench, etc?
Are you good at bounding, sprinting, general coordination?
Those are the questions you have to know before you decide to drop oly lifts. Those and probably some more I forgot! One thing you might consider is doing them as part of your warmup, that way they don't waste much time. For example before I squat I do a set of 3 hang power snatches and then five overhead squats, with 45 pounds, 95 pounds, 115 pounds, and 135 pounds. Then I rack the weight and start squatting. That was I get in some work without wasting time or much effort because if I wasn't doing that warmup I'd have to warmup with light squatting.