I'd say the main thing to do is remind Konami that WayForward is a great 2D developer and that they really love Castlevania.
This.
Trying to pitch an elaborate idea will never work. Fans don't get to design the next game in a series with such a level of control. Anything that's going to be at all complicated and difficult to communicate will never be taken seriously by Konami. If we can't tell them what we want in less than 3 sentences, we're fucked. But if people keep contacting Konami AND Wayforward, expressing interest that they make a Castlevania game, that's something that's actually possible. Instead of telling them what we want in detail, we should try and help 'steer' Konami to make cooler decisions for the series.

I think this would be a great way to go. I want a Wayforward Castlevania. (Starting a thread for this, if anyone else is interested, let's continue the discussion there).