IMO, the reparations question had been legally settled several times already.
If you check my earlier posts in this thread, you will see that it really hasn't.
That's the problem. One day we may have an ultra-nationalist government who will pursue the question of reparations and they
WILL have a legal point; and your idea of connecting the issue of reparations with Soviet-enforced border shifts after WW2 is legally dodgy to say the least.
That's why, if a symbolic form of reparations was agreed upon (I don't know... weapons deliveries for common defense, some Polish-German historic fund to commemorate the victims - something like that) and if Poland said officially that we accept this as reparations, THEN the case would be well and truly closed, and nobody would be able to bring it back in the future.
If you want your eastern lands back
We don't.