As you mentioned I like the SPS:DEC liquidity pool. In that way your SPS can count towards your airdrop as well as your DEC. There can be some volatility in the amount of SPS and DEC you have depending on price fluctuations but overall worth it.
You can delegate your staked SPT to someone like @monster-curator to get curation rewards without doing the work as well.
I don't think SPT in liquidity pool will give you SPS rewards though.
What exactly is the SPS:DEC liquidity pool? How do you do it? Does that give you 2 airdrop points for each one?
I made a big post on how liquidity pools work, how to transfer the coins and get it working. You only get airdrop points for the DEC but in a liquidity pool it counts twice so its like getting 1 for the DEC and 1 for the SPS. Here's the link:
https://www.splintertalk.io/@hiveabbyftp/liquidity-pools-for-getting-those-sps-to-count-for-sps-airdrops-for-pyrose91
I'll take a look at it! Thanks!