With the goal of direct you to mostly free and safe resources, and may I DM you? I have some really strong personal and professional “opinions” with strong backing in current best practice in SLP and psychology. Based on the information you just provided, little guy is primed to develop a trauma response to the wrong technique. Fluency shaping is unlikely to invoke the same fear response as lidcombe, but it will leave him without the proper skills…which will eventually lead to the same cycle of fear/panic that many grownups in this sub experience on a daily basis.