How to raise a boat up a few blocks

I am creating a boat race course on packed and blue ice. I want the boat to be raised up a block, without lowering its velocity or using commands. I have tried using a tripwire-activated slime block launcher, but it slows the boat down so it comes back on top of the slime block. Will a double launcher work (what I tried already, but with another tripwire above the launcher connected to a horizontal launcher)? If not, what other methods can achieve this?

Edit: I tried putting inline tripwire-activated pistons with ice on top, but the timings don’t seem right, and fail when multiple boats go over it. Does widening it work, or creating "highway exits" with blockers to raise each boat, then merging these exits?