No - they won't let a child who dosen't meet the height restriction any where inside the building, in my experience Feb 05....
My dd 10 is over the height restriction and wanted to ride RNRC but she wasn't comfortable going through the queue alone. My 8yo was not tall enough and didn't want to ride so I just wanted us to accompany the 10yo through the line so she could ride and then take the chicken exit with my 8yo to meet my 10y at the exit. No way no how was this happening, they absolutely would not let a child not tall enough to ride the atraction inside the building.
My 10yo had no problem riding alone but didn't want to spend all that time in line alone (even with fp) so we passed. Luckily my 8yo is now tall enough so we will all ride in October.
Sorry I couldn't give better news and have a great trip.
TJ