Some options.
Carrara 8.5 pro $171.00
://www.daz3d/carrara-8-5-pro
Hexagon 2.5 $19.95
://www.daz3d/hexagon-2-5-download-version
I have not tried either using UE4 so yet to be proven for this use so buyer beware.
Hex does not have FBX support and have doubts as to smoothing groups but does support the Daz bridge to Daz Studio which does have FBX (if you don’t want to use OBJ) but both have a Maya like workflow.
Someone suggested that Epic should look to Autodesk to partner with in making more affordable editing tools but working with Daz 3D seems to me to be a no brainier. If it had FBX and SG’s could be sold on the marketplace tomorrow for twenty bucks. 