Here's the idea that I stole.
The example is for a tunnel wedge intake but can't be adapted to others.
Tunnel Wedge With K&N Top Filters
Basically a drop down base plate, that allows you to find a couple extra centimetres.
Same vendor also manufactured and supplied mine, an after a bit of home customisation to fit. Job was done.
I'm pretty sure many others could fab them up too, they don't look all that complicated
Good luck with it.