i’ve done it in the past just w/ timeshifts to get previous and next frames, vdb combine all three, chuck a vdb renormalize sdf afterwards for luck
in fact i’ve done this with as many as 7 frames 😬 it does help but there will be some oversmoothing damage. i think i remember getting better results with the A multiplier in the combine at 1.0, even though you might think 1/3.0 would be approriate 🤔 having extra interior and exterior bands was worth it