I got this from dattos video about Onslaught talking about having a big scrap dump if u just hold on to it. I thought of the big guy enhanced rasputin Frames, from Season of the worthy? They could act as like a combination between decoy and turret and they stick around until they die and dont despawn after a boss wave. Also after u summon it u can dump like 2k for a small amount of healing, 4k for moderate and 6k for large. That way u have to balance and decide either to upgrade decoys and turrets or just keep the frame, but you could have both as well if u manage resources well.