its understandable you want to cover many bases and
start progressing quickly but I would not go with max 2 new subs in a stack
or one custom with 3 cores but starting with a store bought sub non custom is highly recommended.
Ideally start with one sub if your new to subclub.
If you look through the journals you will see with resounding consistency those who start 1 with sub and stick with it for at least 1 month progress faster.
For quickest results in procuring a good job and/or initial business endeavors I would go with Ascended Mogul. After a month if your taking well you could stack House of Medici.
For results with your ex-wife --Primal and Regeneration hands down.
Although It sounds like you want to run Khan and are most drawn to that, in which case go for it.
While Khan, like all SubClub subs, work with your intention and preferences, from my understanding of Khan is just likely to have you completely re-evaluate wanting to be in the relationship again at all as it is to have you succeed at getting back to it. You may also find a way to do right by the people you care about it and still close that chapter. I don’t know.
For the specific issues you mentioned Emperor would not be well suited .