Thanks for your question.
The bad news is that short of marrying your partner, there is little you will be able to do to help him secure Leave to remain in the UK unless he makes an application on his own merit under one of teh categories of the Points Based System (PBS).
From the information you have provided above, it would seem your Partner would have to make an application for either a Tier 1 (General) or a Tier 2 (General) Visa.
Failing that, if you do intend to marry within 6 months of him arriving in the UK, you could consider a Fiancee Visa.
Your final option would be to get married in Kosovo and then for him to make an application for a Sppouse Visa.
I hope this answers your question. If so, kindly click accept.
If you wish to discuss, please feel free to ask further questions.
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