Addressing performance portability across a variety of accelerator architectures presents a significant challenge in developing applications and programming systems for high-performance computing environments. Recent programming systems dedicated to performance portability have notably enhanced productivity in response to this challenge. However, the complexity escalates when compute nodes are equipped with multiple types of accelerators, each with its own distinct performance attributes, optimal data layouts, and binary formats. To effectively manage the complexities of programming in multi-accelerator environments, we introduce CHARM-SYCL, a performance portable programming model for extreme heterogeneity. This platform integrates a SYCL-based performance-portability programming frontend with IRIS runtime backend designed for extremely heterogeneous architectures in Oak Ridge National Laboratory. Our initial assessments suggest that CHARM-SYCL offers a promising increase in productivity and maintains reasonable performance when compared to vendor-specific programming systems and runtimes.