Nuclear Union can be still a pretty interesting title if 1C will do some small adjusments of course.
1) Revive the developing of Nuclear Union
2) Invite someone who has rich experience and skills with GEM engine already, someone like DMS
3) Temporarily hire/lend someone whos got skills with similar engines to GEM, someone from
http://www.4a-games.com or
http://graviteam.com/about-company.html
4) Give it some time
5) Profit
(Of course GEM engine is not that similar to 4A engine)