Don't worry, it will work...It will not "curl"..(of course it depends on how good he his at shaping the sail, if he is useless or inexperinced...you know what I mean, right??).
I have the same system on my cruising and racing sails, and it works like a charm. We tried sails with and without full top batten..liked the shorter ones best. So now not one single full...much more versatile.
I don't have the running backstays.
Here's the crusing sails photo:
and the racing ones (please note my racing genoas also have battens):
And bellow a sail we tried with full top batten..didn't like it..
but again, that's just me...some "sail guru" here might say the opposite..we never know...
I personnaly think it is a good choice. Let me know in the end, OK??