Its been ages since I last used that frame but Everything about Diadem Elevate Tour reminded me of LM Radical. Feel, performance. I used to have Radical MP but added weight to the handle so final specs were more or less the same as Elevate Tour.That got me hyped! What do you mean by "closest"? 16x20 Liquidmetal Radical MP would be a dream!
From my memory LM Radical was rock solid with suprisingly good spin potential for its string pattern. Light but stable. Great control with power on top if needed. No fancy things going on to „mute” the feel so it was very connected but also a bit on a stiffer side for me. Was using 2x overgrips on it and that helped (like Djokovic ha!)