I'm flying mostly from/to RIX on BT; sometimes LO, LH, OS, or SK. Around 10-15 return flights within Europe per year. Lowest economy class.
How do I choose FFP? The only benefit I'm interested in would be business class check-in. I found out that Eurobonus Silver gives that; but at required 20 000 miles and low earnings in economy, it would be quite hard to reach.
Are there any other options to get business check-in (without paying for business ticket

) or should I just stick to SAS Eurobonus?