I don't quite get it. I understand that you want to use Marriott points to get the travel package which allows 7 hotel nights and 120K FFM into one of several different airline programs. I'm not familiar with the options for mileage transfer from Marriott but obviously there are some *A ones to choose from as well as DL. While 120K can get you a F award tix on SQ it completely depends on the route you want to fly. Within Asia 120K will get you many places in SQ F e.g. SIN-NRT-SIN. However US-Asia is trickier and I can only think of US requiring only 120K for their *A F award US-SE Asia or US-N Asia. BMI might be another possibility with the cash option but i don't know how that work for US-based members. Every *A airline has different mileage requirements for Y/C/F *A awards so you would have to check the eligible ones (for transfer from Marriott that is) for the best bang for your mile and see where 120K get you a *A F award US-Asia which would allow you to try booking SQ as carrier.

Therefore you will have to do some digging throufgh the different *A airlines award charts. If US is an option to transfer the miles to then that might be your best bet with the 120K limit. I don't think they will get a lot of seats allocated from SQ but that holds true for most *A airlines, as SQ is quite reluctant to release too many (meaning more than 1 ) F award seats to partners if it doesn't have too. Sometimes LH seems to have 2 SQ F seats on offer for the same flight but that only happened two or three times when I was querying them about award availability for a range of dates. Maybe this holds only true for the FRA-SIN-FRA route which is what I tried.

Hope this helps. Cheers ...