I'm not allowed to do that at all.

I'm also lost on why you think this will make bank.

If it's a basic frontend and no one in your company cares, no one else will.

And you will run into 'conflict of interest ' very fast.

An 'idea' is not worth anything.

If it affects your daily work I would expect you to just do your job which might include making a frontend to make your job easier in company time. After all the company pays you for your expertise. If I would be your boss, I might even be offended by this way of thinking tbh