Thanks. This niche trick is useful for optimizing future splits for someone like me who's aiming Foils.
If your first two splits are disappointing like Prism -> Prism (or Copper, Psyche), you can just hold off on hitting 'Confirm' until you get a variant and split it later.
Another approach is waiting for a super-rare variant from the start (If character gain 150xp, you can reroll from the very first split) But even with reroll, splitting before Copper / Psyche / / Refraction get hit the pool makes better odds to pull Foil.