Sorry to hear about your problem. I just did flight tg 920 in F on the A380 and it was great.

I started on one award and did Middle East to South Asia for 65k one way with a 12 hour layover in Fra. LH from bah-fra then TG fra-bkk.

I also then got creative and originally had a one way award bkk-fra-ord using TG in F on the A380 then LH in F on the 747 which was 70k miles. However what I did was make it a round trip from South Asia to Southern South America with a stopover in ORD. So for 160k total (should be 180k per united.com) I got the following all in 3 class F:

bkk-fra on TG A380
fra-ord on LH 747
ord-gru-gig-gru-ord on UA 777
ord-nrt-bkk on UA 777

I'm going to tweak the award to see if I can dump the UA segments to get back to Bkk and either route via Europe again using LH/TG or some asian carriers SQ/NH etc. via the pacific.

Sorry but i had to tell someone. :-:

Now your situation sucks! Europe to South Asia is 15k more and you don't get to do any transit anywhere. However what you could do is:

Go LH fra-dxb on the A340 in F then get on either: the TG two class a330 dxb-bkk (i know it isn't 3 class) or go SQ with good availability via SIN to bkk on their a330. You can get some time in DXB and possibly SIN if wanted. Not the best option but it is another option, although you would be paying more miles for only the LH being in 3 class f whereas I know TG is 2 class, not sure about the SQ.