Deuterium (D2) shattered pellet injection (SPI) was envisaged to address runaway electron (RE) avoidance in ITER via a strong dilution cooling before the thermal quench [1]. However, our recent interpretative modelling of D2 SPI into a JET H-mode plasma using the 3D non-linear MHD code JOREK demonstrates that the ExB drift of the ablation plasmoid towards the tokamak low field side (LFS) could substantially limit the core density rise needed for RE avoidance, where E and B refer to the electric and magnetic field, respectively [2]. This limits the effectiveness of the LFS D2 SPI strategy. Further studies on the fundamental mechanisms of plasmoid drift demonstrated a quantitative agreement between 3D JOREK simulations and existing plasmoid drift theory [3]. To overcome the limited efficiency of D2 SPI in RE avoidance of future tokamaks, a plausible alternative is to use a so-called trace neon SPI scheme, where a small percentage of impurities (typically neon) is added to the hydrogen-isotope SPI. This is envisaged to reduce the pressure imbalance of the ablation plasmoid via stronger local radiation of impurities, thus suppressing plasmoid drift and improving core density rise [4]. Experiments with trace neon SPI (including different neon mixture ratios) were conducted in the final experimental campaigns on JET and provide a valuable dataset. Experimental analyses and interpretative JOREK modelling of this series of discharges are on-going to examine the trace neon SPI scheme, which is crucial for developing injection schemes for the ITER disruption mitigation system. We will present latest results on the modelling and analyses, including a pure D2 SPI discharge carried out in the same experimental campaign as a clean reference. [1] E. Nardon et al. Nucl. Fusion 60 (2020) 126040 [2] M. Kong et al. Nucl. Fusion 64 (2024) 066004 [3] M. Kong et al. Nucl. Fusion 65 (2025) 016042 [4] A. Matsuyama Phys. Plasmas (2022) 29 042501