Got some free K Wool/ Kaowool, have a question...

We just had a new boiler installed this past couple months at work. I noticed a large bag full of some type of insulation left over that maintenance was just going to throw away. I asked what it was and was told it was Kwool and I could have the whole bag if I wanted it. Well, I took that sucker home real quick. I did a little research on here and I think I've figured that in the boiler world its called Kwool, in the wood stove world it's called Kaowool. I found the company that we got the boiler from (Cleaver Brooks 450 hp) and they had some ratings on the kwool that I have. The website stated that it is rated to 2300 degrees continuous with a 3200 degree melting point. I opened the bag when I got home and discovered 7 complete rolls of 1"x3"x25' and 1 roll of 1"x2"x12'. Fantastic and free
This is the tricky part; I'm purchasing a 6" flex liner this summer and would like to use this insulation on the liner. The problem is, I don't think I can wrap it around the liner because the terra cotta liner in the chimney is only 6"x10" inside diameter. I was thinking of slightly ovalizing it and dropping into place. What I want to know is, can I cut the Kaowool into small 1"x3" strips and just start shoving and packing them in between the liner and the chimney using a rod to push them all the way down to the blockoff plate, then cap off the top? I believe I have more than enough to do it this way. The chimney is only 13' tall. I also plan on using some of the Kwool to insulate the blockoff plate. Anybody have any opinions on doing it this way?

On chimneylinerdepot.com, there is an oval liner sizing chart. If I go with a 6" liner ovaled down to 4.5"x7.5", do you think I could get some wrap on that and slide it down?

Thanks for your help. I looked down the chimney the other day with a bright flashlight and the tiles seemed pretty straight. I've got a 4 ft. straight edge that I'll stick down the chimney and lay it against the side to see how it looks tomorrow. I need to get a few work buddies over next week to pull out the old stove. I think I'm going to have to knock out a lot of the smoke shelf to get a liner down it though. I also discovered some missing mortar/cracks that will have to be fixed in the fireplace itself. I'll buy some refractory cement in a tube to do that work.

I'll do a search for the double wall oval rigid liner on google to see what I can find...

I think for my situation, I'll go with an ovalized 6" flex with some poured in insulation. Chimneylinerdepot.com has the bags for 50 bucks each. They had a formula for figuring out how much of the mix you need. It'll take no more that 4 bags for my needs.