Any plans for enabling GOG Connect for this game?

No, not at the moment. Maybe at some point in the future, we'll see.

Thanks for the info.

I will leave a suggestion then. I already have the game there at Steam and I like to support DRM initiatives, but I'm at a loss now because I don't want to pay for everything again. So here is my suggestion: Allow Connect on the current DLCs. This way anyone that owns the games+dlcs there at Steam can buy the game here to support and get access to the content they already own.

I know most companies do the opposite, allow Connect to the base game knowing they are still going to release 100+ DLCs - this also works, but I think this one is more fitting for a larger player base and games that have multiplayer, because multiplayer is an encouragement for gifting other copies of the game so Connect actually helps selling more copies.