Very likely you can. You need to study the venting standards for the equipment as described in the installation manual until you understand them. I would guess that the method you want to use would be among those approved by the manufacturer. Who is going to install this equipment? If you don't understand it, you shouldn't do it. If you are going to have someone else install it, they should be able to show you the method of venting they are going to use and show you where in the manual that method is approved for installation.

$250 a ton is a decent price in Vermont. I bought a cheaper brand this year but the pre-buy price for the the ones I used last year was 265. Last year it was $235 I think. I have had my stove 4-5 years. Pellets have gone up a little each year. Not sure it would be worth it if it goes over 300. Of course it depends on the cost of oil. One year it went up due to gas prices and the cost of trucking. Now it is a scarcity of sawdust with the slow down in construction. I have a harman p-68 and the fan does make noise and I do turn up the tv. Our tv is not close to the stove but the noise is still there. There are quieter stoves however. I direct vented our stove so that may be an option for you if you want to move the stove. I would talk to a dealer about having a tv over it. I don't think the heat would be an issue. The dust might be. good luck

As a natural product this should work well if your situation allows for the thickness. What is below your present floor ? Will it handle the added weight ?

Both are good brands but there are other great brands also. I have a quad which can be pellet picky in comparison to most harman units. Hearth.com has a forum dedicated to pellet and corn burners. One other quick tip is most multi fuel units are less picky when it comes to pellets. Here is a link that might be useful: pellet forum