Vfl Bochum you might take into consideration, that FTL / SEN / HON last for two years, while you have to requalify for UA every year. You might also try to get a business adress for your M&M account outside of Germany, so that it is only 100k you need to qualify for SEN.

Take also in account, that cheaper fares earn 100% onj UA while you get only 50% on LH - but as you are flying for Business reason, you certainly will not fly in W, S (but who knows).