I considered something similar when I applied. I was using an agent in the process.
Language schools do not qualify for DTV. The qualifier is the cultural program; the language part is just something they add to it. I thought this would be a great way to go. The challenge, as pointed out by my agent, is that it could be seen as a language program by the Embassay and be rejected.
This is one challenge with soft power as they are not clearly defined, except for cooking and Muai Thai.
The Agent I worked with is ISSA. They have a solid success rate and back it up with a guarantee. They told me that they would process with the cultural/language program if I wanted, but would not guarantee results; meaning if I got rejected they would not refund or resubmit for free. Instead, they recommended Muai Thai or cooking with guaranteed results. I took their advice and all went smoothly.
BTW… ISSA is great. Here is a coupon for - discount on their service: I1S94UKY
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