We've used 3 wire electric for strip grazing with pretty good success, BUT in my experience there is often one lamb that just won't respect it. Earlier this year it was a Ryeland ewe lamb, one of a small number we bought in. The fence was fine, tested 5K volts on all lines but she would just push straight through. I even took the clippers and trimmed her ears and head (you know how wooly Rylands are round there) so there was good lamb to wire contact. Nothing, it was like she couldn't feel anything. Lush grass on her side of the fence, she just wanted out. A couple of years ago it was a Kerry Hill tup lamb. Of course, he was first for the freezer.
Anyway, my point is, if you want foolproof bite the bullet and go for stock fencing. With a bit of work and a farm jack (OK, a LOT of work), you could move it away with you. If you plan to go down that route, using gripple Ts on H strainers might be a good idea and don't bang the staples in all the way on the posts (bad idea anyway). Not that I've been spending all my "spare" time fencing this last few months or anything...