You don’t say which car you have, f or tf. I happened to have the tf circuits open on the computer & had a glance at that page. I didn’t look at the f diagram because I was busy writing up some other work & assumed Roverlike would have cast his (impressive) expertise over the problem, coming back with an erudite response. He’s not been on for a while, hope he’s OK.
Yes it does look like the switch from your description, two fuses failing is not unknown but it would be off.
Replacing the switch mechanism isn’t a tough job & it can be done without a major strip down.
My recollection is one of removing the three screws from the steering column cowl, then the two screws from the stalk/switch assembly, wiggling the switch out, unplugging the connector & in true Haynes fashion replacement is a reciprocal of removal.
It is a good while since I replaced one but even if that isn’t 100% it’ll be a good enough outline for you to follow.
M