And see, in here lies the problem...most of us..this goes straight over our heads. There needs to be a simpler way of doing this....without github etc etc. The issue with crypto's is its those that are techies that developing it...but to get it to have utility...it needs to be simpler then PayPal, both in setup and in use.
Can it be done? A clean plug in widget that requires NO tech knowledge?
Yes, mostly. It will always require some tech knowledge due to the nature of FinTech/Crypto-Currency, and what qualifies as "tech knowledge" will vary from person-to-person.
Don't even worry about that pre-generate keys stuff above, it's not needed anyway. Have you tried the WordPress Bitcoin plugin? It pays directly to your Electrum wallet with minimal configuration. That would be extremely trivial to port to Dash for someone who is familiar enough with python.
This stuff's really not as hard as it seems, as long as fiat/KYC isn't involved. The DAPI isn't needed, and it could be done right now, by some enterprising entrepreneurs.