Your problems won't go away just by buying a belly or long putter. As with all aspects of game, it requires practice. Like anything it takes a lot of work to do extremely well and get to where your mind will totally believe in it.

It is important to get properly fitted for a belly or long putter. You can't just extend shaft of your standard putter and expect it to work right. The head is too light and shaft too flexable. The heads of belly and long putters are much heavier and have special shafts to handle extra length and weight. 

A simple to way to measure for a belly putter is to attach a string with a weight to middle arch of a pair of glasses. Take proper address position with ball off left heel or left instep, shaft at 90 degrees with the sole of putter flat on ground and butt touching your belly with medium pressure and see where string hangs. The proper shaft length should put string one inch on inside of ball.

As always fundamentals still apply, starting with alignment. Alignment must be correct for backstroke and forward stroke to follow. If alignment is bad, other two will be bad also. 

Now to big question. Should everyone go out and switch to a belly or long putter? NO! If you are a good putter, don't mess with it. In other words, "don't fix what ain't broken." Most players would have a good or at least better stroke if they just allowed it to happen. We get in way by trying to manipulate putter on right path and steering it to hole. Just let putter do work. 

One important thing to keep in mind is that a wheelie will exert a lot more pressure on your snowboard than what you normally would. This means that if you have a defective or damaged snowboard there is a very good chance that you will snap it when practicing. You can reduce risk of snowboard failure by placing less weight on ends and not raising your snowboard as high off ground.

Wheelies are a fun trick that is not reserved just for rides with wheels. With some practice you will be able to wheelie like a pro on your snowboard and will soon develop skills to do other wheelie related tricks.