glperky,
The ladies are doing a great job of talking through possibilities with you. I wanted to chime in with a few thoughts and questions too. It is true that kiddos do not need to know the names of the letters in order to read, so I would focus more on learning the letter sounds instead of the letter names and letter sounds both. Learning both names and sounds can be a challenge to keep straight!

Of course, later it helps to know the letter names in order to spell, to copy, to alphabetize, and to use the dictionary. However, to read only the sounds are needed.
Next, I am wondering if your child has had any formal curriculum that actually teaches the letter sounds and reviews them on a daily basis? The reason I ask is that all of the online options and videos you mentioned are great, but in order for the sounds to really stick (for quite a few kiddos), many different senses are needed to be employed and much practice is needed. This doesn't mean that drill, drill, drill is the needed method. It just means that regular practice with the sounds in a variety of ways will make all the difference.
It also means that once your kiddo starts to pick up the sounds you keep on going, making sure you are not pausing and taking breaks. Phonics is one of those things that once you begin, it helps to keep some steady practice going until kids really grab on.

We took the last three summers off with my last little guy during the process of teaching him phonics, and I cannot tell you how much I regret that! It was at a time when he really needed to keep on going, but I was just so busy writing that I lost steam with the phonics. So, one thing that I would encourage you to do is either commit to really beginning phonics (and learning sounds) formally, and then you're in it for the two-year haul until most of the phonics is learned; or wait until you are ready to be more committed. I am not saying that you need to commit vast quantities of time to phonics daily, but I am saying that 10-15 min. daily (5 times a week) is needed on a regular basis to truly see progress.
Phonics is one of those areas that also requires a teacher. It requires interaction and the teacher and child sitting together and sharing the words, books, letter sounds. It is work, but it pays off.

We did The Reading Lesson here in a stop and start fashion that really set us back. After we finished it completely, I had to pull out an old phonics program I had here and go almost completely through that simply to build fluency and to review (because we had stopped the Reading Lesson over two different summer breaks on two different years, which made remembering everything really tough for my little one). I could have probably just gone back through the Reading Lesson all over again, but I just didn't want to redo it all again. So, I share this to let you know that amount of teacher time spent steadily teaching phonics can make a big difference. I am convicted of that anew, and I am not taking phonics off this summer with my youngest one!

He is progressing, and I can see that had I taken a big break right now all of that slow but steady progress would have been lost...again. With my older three, I was much more consistent early on in teaching them phonics. What a difference that made!
It is also possible that your son has this as an area of struggle for other reasons. We won't know that for sure right now unless you have already devoted several years steadily teaching him phonics 5 times a week with no progress made. One thing I am wondering if whether your son is able to do the writing that is within Beyond right now and the spelling, or whether that is tough too? Is it possible that he might be better placed in LHFHG? Feel free to share your thoughts.
Blessings,
Carrie