Fsappo
Minister of Fire
No need to buy all new just find some one with an ovalizer
2nd. Ovalize and insulate. I'll bet BGs pension that you don't have the 2" clearance. I just went thru researching this with some help here. Also, tile removing can be insanely easy or a terrible job. It all depends on how tight to the blocks the tile is. I have literally removed 20' of tile in an hour or so and I have spent hours trying to get the first tile out.
There is a thing called a tile smasher, or I call it that, it hooks to a drill. If you lower it down and spin it slow and start hearing a hollow sound from the tile when they are hit, your probably in good shape. If it sounds like a dull thud, you may be in trouble.
Crap, even without an ovalizer, you can, with some patience and a 2x8 ovalize that liner yourself.