Basic Rule of Woodworking #18: Veneers will always come loose and peel off unless you want them to.
Steaming can create some very undesired effects on the area you're talking about and I would agree with John on sanding. Use care of course, but I think you'll be better off. One thing though, do be sure when you have finished that you have a flat, smooth surface (no chunk holes) to apply the new veneer or "Rule #18" will again come into play and it won't look too good either!!!