The 4 year time frame you are looking for is going to be tough with just a 10% over since there is about 5%+ of value of forks on those coins and the value of the collectable itself.
The Fork-value is closer to around 2.5% of the Bitcoin value. But since collectibles have to be physically delivered, I doubt this is what OP is looking for.
PM me for reason.
I'm still curious: can you share (PM?) the reason?