Noah,
Out here your probably not going to run into much regulations on hawks, but then you never know. I'd say go with what you have and make it work.
My hawk handle is 19 inches overall, and my cutting edge is 3 3/4 inches... No one has ever said I couldn't use it! Also, I like to keep spare handles around, so you may want to get some if you haven't already. Take your hawk with you so your sure to get the right handle(s).
I use a slab from an elm tree that measures about 21 to 24 inches across and is about 8 inches thick. Get yourself something like that and mount it to a good solid post...
If Claude is reading this, maybe he could bring up that picture he posted a year or so ago about hawk targets, the one he used. His picture is worth a thousand words!
Good luck to yae! Oh yes, 7 normal steps from your block is a good starting point. You'll do fine and make adjustments from there! :thumbsup: