Ares V with the RS-68s would not have been able to fly because of the base-heating issue. They would have had to go to Ares V Lite with the 5 x RS-25 core, 5-segment boosters, and EDS. This would have given 140 tons to orbit compared to upwards of 180 tons for the biggest (and latest) Ares V designs. The J-2X was probably also not going to fly because it was getting more expensive than RS-25s. EDS can switch to RL-10s (or maybe RL-60s) but this would doom Ares I, which was already a badly compromised design. You could replace the Ares I upper stage with the Ariane 5 for maximum continuity and a built-in ESA component. However, I think the most viable option would be completely replacing CLV with a man-rated EELV. Delta IV Heavy would probably work best considering the size and weight of the Orion CEV and some groups were already studying the possibility of hybrid vertical assembly in the VAB and using an MLP. Of course, the Ares V Lite plan was to replace both the CLV and CaLV for EOR lunar missions, so that might leave the EELV-derived CLV exclusively for space station missions.