Still definitely worth it imo. You can train RFI standards, or vs RFI, vs three bet, vs four bet etc. And just analyzing solver strategies gives you quite a bit of insight into alternative lines. The point isn't to play like a solver, it is understand what GTO strategies are, so that you can observe how your opponents deviate from GTO and how you can profit from that.

So for example, in order to know if someone is three betting too wide, or three betting the wrong types of hands, you need to know GTO three bet standards vs a given RFI.

For sure solvers alone aren't enough in your situation. You also need to study the dynamics of multiway pots and develop strategies for them. But I do think vision will be worth it for you.

I recommend start by watching some videos of people using vision. There is a lot of footage out here.

This is probably some of the best :

https://www.twitch.tv/videos/694405870?filter=archives&sort=time

In this video you have two RIO Elite coaches using vision for a couple of hours to analyze hands from the HU challenge. So it will start to give you some insight into solver strategy, and learning how to play various board textures in different situations. For example if you have a huge range and polarity advantage, you might want to bet small with your whole range. Or if it is mixed, then you might want to employ a mixed strategy of checking and betting small, especially at high SPR.

Even though solvers teach us about heads up play, I think a lot of the concepts can apply multiway, although not directly. Like we probably don't want to do much pure bluffing in a four way pot, but just like heads up we don't want to just check give up everything we aren't betting. We need a continuing range. And then understanding how different ranges interact with different boards. You can even look at looser ranges by giving them button open for example, or BB defend of SB steal.

And even in your loose games, you will often end up on the flop, say if you come over the top pre with good aces after some raises and calls, and only one person calls you. So it is very useful to know how to optimally play these hands in a gto way against a given range.