Compliance & Res. Modeling: E+A+A: Raised floor R-0

Cabec folks, I'm modeling an existing residential project (1 story) that's being taken down to the studs and re-built all-electric. The floor area is split between uninsulated slab (50% and uninsulated raised floor w/ crawlspace. Questions: 1. If the Owner cannot afford the extra insulation to match mandatory R-19 raised floor requirement (2016 Res Standards), what can we do to pass code? -Is there an exception for this type of renovation? 2. Should we model as existing + A+ A or as New Construction and model the floor without R-19? Any help would be greatly appreciated :) Jenna