Very Early Childhood stutter emerging

Very Early Childhood stutter emerging Hi all, just joined. Was wondering if anyone has any advice or tips for therapy. My son will be 2 next month. Both my kids were early talkers with an insane vocabulary. My 1st knew words like dodecahedrane at about 22 months. I'm not exaggerating. He learned it from Team Umizumi and I had to look it up the 1st time he said it to me. Anyway, my almost 2yo isn't quite as vocabularily-inclined but his language is still very advanced for his age. About a month ago he started to develop a little stutter, which I at 1st just chalked up to a developmental phase, like maybe his thoughts just weren't quite caught up with his language. But it's progressed a lot more in such a short time. He's elongating the first syllable of words, sometimes for several seconds. He's definitely experiencing frustration about not being able to get words out and on a few occasions has just given up and pointed instead of completing the word. His teeth clench and his face turns red with the struggle, he blinks his eyes and scrunches his little face. Lately he gets louder in his fervor to push the word out. Makes sense to a 2yo right? Just use more volume to force those syllables out. I've inquired casually to a few people I know who studied speech therapy and my Sister-in-law mentioned it to my nephew's therapist. The consensus seems to be that it's too early, if he's still struggling at 6yo (6?!) then we can start doing something. Five years seems like a long time to watch my baby struggle. I messaged our pediatrician and the nurse messaged me back that we can talk about it at his 2yo appointment, which is fine I guess. A month isn't that long but I'm not the type of person that can hurry up and wait. And I also think as lovely as our pediatrician is, he's going to tell me to wait until he's older. We've already started addressing it a little. We wait until he's finished talking or until he gives up. When he does give up, we'll say something like "it seems like your words are getting stuck today. Do you want to show me what you need?" I've also talked with his older brother who is 3yo to tell him "sometimes your brother has trouble finding his words. When he does, we have to find our ears and listen without interrupting so he can tell us what he needs to say." What else can we do at home before we're able to get him into therapy? I've done a bit of research on the Lidcombe Program, which seems to be a lot of positive reinforcement when he's not stuttering? Does anyone have personal experience with this? I worry that at this age, when his language should be expanding exponentially, his frustration my lead to him regressing to pointing and gesturing instead of establishing new language skills. Are there any books for young children anyone can recommend? I should also say that his father has a mild to moderate stutter that worsens when he's on the phone, talking to strangers, very tired, or has been drinking. My SIL recently told me that his brother also has a very mild stutter, which I've never noticed. So there's definitely a family history. Any advice is appreciated. Unless that advice is "wait until he's 6" because I am physically and emotionally unable to do that.