I would have thought getting a nice custom made/bent/fitted barrier would have been cheaper than stanchions fitted around. Those things aren't cheap
and you still have to have a railing. I would seek a few metal workers to give you a quote.
The biggest concern isn't the safety
railing however, it is how it is fitted to the deck
. A one piece assembly is going to take stress over a larger area and thus give you greater support. A stauntion type assembly is going to have more movement and thus more stress in the deck
attachment point of each individual stauntion. More chance of failure and not a secure feel. Plus it won't look as nice. Just my opinion.