I'm not sure what you mean by maintain? They will still have normal minion degen, and i may be wrong but i didnt think minions could be enchanted. again, i may by wrong
Sorry if im not answering your question, as I also am not sure if you can enchant minions. But fleshgolem has a recharge of what, 30 seconds, and costs 15 E to cast, and if your current flesh golem is getting low, let him die, and recast fleshgolem and you get a brand spankin' new one by using the exploitable corpse that the old one left.
If you were able to enchant the golem with life bond, the -1 E regen would end up costing much more in the long run in E regen over the life of the golem, as now you only get +3 pips of E regen and not 4.
I think the question is: "If life bond sends damage from the golem to me, and dark bond sends damage from me to the golem, how does damage get distributed with both active?" I have absolutely no clue what the answer is. Maybe Carinae knows...