Hello Alex, I hope you are well.
Maybe you could invent or create an adapter to integrate your plugin with the plugin https://wordpress.org/plugins/ethereum-wallet/ and perhaps connect them in some way. It’s just an idea because really integrating your plugin with ether would be a true wonder.
To answer your question: I have performed some analysis in the past and an ERC20 adapter to the eth wallet that would not lose money on transaction fees would take me more than a month. As mentioned in the FAQ I do not accept payment for custom work, but if I do end up implementing it I will post here and on the blog.
If you were to list your coin in CoinPayments, then of course the plugin would be able to use it with the existing coin adapter. But it’s up to you to decide if this is viable for you.