Codifying tariffs would also mean they probably can't change it every day to different numbers, no?

They can put a procedure in place to allow for some changes, just not under the ridiculous “state of emergency”.

Potentially they can codify broader authority for executive to regulate tariffs…

Too much of that should, but probably won't, set off every alarm and siren with the conservative justices, for stepping way over the line, after their reasoning on Chevron.

The bigger problem would be their own party members.

In what sense?

The GOP in congress has struggled, even last election cycle to gather enough votes to take action.

They ran through several rounds where they couldn't even pick a house majority leader among their own party.

The tariffs would be very difficult considering each of their local concerns.

Additionally, in the first Trump presidency congress temporarily removed the debt limit. I don't think there are even votes to do that now so compromising on how to fund the government is going to take a lot of effort (that can't be spent on tariff rates).

I wish they would replace the debt limit with something more sensibly designed like the German (or Swiss) debt brake ('Schuldenbremse').

See https://en.wikipedia.org/wiki/German_balanced_budget_amendme...

The American debt limit regularly shuts down the government, but debt still keeps piling up. The German debt brake doesn't seem to shut down the government, but actually lead to a substantial drop in the debt-to-gdp ratio.