Rebalancing 50/50 has similar characteristics to AIM, add when down, reduce when up. A difference however is that 50/50 never exhausts cash reserves, but it wont have you as heavily in stock after a sizeable share price decline.
Rather than a 2x leveraged fund, if you can find a asset that has a consistent beta of 2 then that's as good, but doesn't incur the cost to borrow that 2x leveraged ETF's do. Given that such assets are difficult to find, the next best is to hold a diverse bunch of assets in near equal weightings, from that set likely one will have a beta >= 2 (but the actual asset with that characteristic will change from one period to another). So like holding a core set of relatively stable assets and a proportion of assets with consistently very high beta (up and down). The other benefit is that often there will be two (or more) such cases and where as one is down (high negative side beta), the other is up (high positive side beta) that often counter-balance each other (and more often leave a surplus positive benefit).
Whilst you might replicate that with AIM, simply rebalancing holdings back towards equal weightings periodically can be simpler to manage. Maybe just selling down the single best candidate and topping up the worst candidate once/year. Best applied to sectors as sectors are much lsss inclined to fail.
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