would there be a problem (other than an inability/bad shifting) with putting a 55x36 to avoid needing to buy new chainring bolts and just run the 55 as a single ring on 6800 cranks and 6870 deraillier?
If the 55T fits your 110bcd then it should work. You can hunt down some spacers and use normal chainring bolts to run it without the little ring but like you said that requires spending more. Check that the chain isn't too tight in the gears you're likely to run.
Chainring sorted, just hope it arrives in time!
would there be a problem (other than an inability/bad shifting) with putting a 55x36 to avoid needing to buy new chainring bolts and just run the 55 as a single ring on 6800 cranks and 6870 deraillier?