Moped Army

I have a rigid swinger and the seat is stupid high (to me) even with the high bats it came with. I wanna long seat this bad boy but not sure how to go about it.

Is the 3/4 seat the only legit option with out welding?

What are ya'lls thoughts on welding a cobra like top bar for a top tank and long seat?

If anyone has done anything like this, post some pis please.

thanks guys.