I don't know if anyone has done this yet this year but I just created some of the best Diamond Dynasty pitchers into a custom roster to help me practice. It's not all the pitchers just the ones I've faced the most. It has Edward Cabrera and Crochet and 93 Burnes. It also has some legends listed under current players. Tom Glavine is David Peterson, Cliff Lee is Vince Velasquez, Frank Tanana is Andrew Heany and Fernando Valenzuela is Julio Urias.
The roster is listed under DD Pitchers and my username is yankeeian24.