When the wallet is rescanned at startup in `bitcoind`, there seems to be no way to interrupt that in a clean way (other than forcefully killing the process).
{
    {
        LOCK(cs_wallet);
        if (IsLocked())
            return false;
        
        unsigned int nTargetSize;
        if (kpSize > 0)
            nTargetSize = kpSize;
        else
            nTargetSize = std::max(gArgs.GetArg("-keypool", DEFAULT_KEYPOOL_SIZE), (int64_t) 0);
        
        
        int64_t missingExternal = std::max(std::max((int64_t) nTargetSize, (int64_t) 1) - (int64_t)setExternalKeyPool.size(), (int64_t) 0);
        int64_t missingInternal = std::max(std::max((int64_t) nTargetSize, (int64_t) 1) - (int64_t)setInternalKeyPool.size(), (int64_t) 0);
        if (!IsHDEnabled() || !CanSupportFeature(FEATURE_HD_SPLIT))
        {