You seem to think this is like the NBA and he can pick his team and Houston is going to bend over backwards to trade him where he wants. They will ask a premium for him and if they don't get it, they won't trade. They don't have to take anything they don't want. He will not be cheap!
Sure I would love to have Watson, but be realistic, we don't have what it would take to get him. It's just a pipe dream and no matter how many times I hit the bong, I don't see it happening. So you Please tell me what do we have to offer to acquire Watson? If they trade Watson they will go for a total rebuild wanting a very high draft pick and a handful of other good picks. What do we have to offer for a player of Watson's caliber and what would we have left after giving them what they want?
Actually, we kind of do have what we need.
We have players, a QB and picks in future years.
We COULD do it. Moreover, if Watson is willing to do a Trent Williams and sit out, then you trade him while the value is at its peak. The WFT could have gotten so much more if they'd just traded Williams, but no, they had to be the douche canoes they are and they screwed themselves.
If Watson is truly done... you just take the best deal you can get and move on.
If Watson wants to come to LA, you negotiate a fair deal and end it. OF COURSE Houston will try to convince Watson and his people to go other places with their plethora of picks, but at the end of the day, this is why teams don't give out no trade clauses... they literally lose all the power.
If Watson says, "LA or BUST"... the Texans can either trade or draft a rookie, leave Watson at home and get a ton less for him next year. Sounds stupid, so that's how it'll probably pan out...
Anyway, there are multiple resources that detail that the Texans and Rams can do this deal, presuming the Rams are interested.
If this deal doesn't happen, it won't be because "it can't be done", but rather that one or both chose sides chose not to.