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Hi all, I'm new here. I've been playing guitars for ~15 years and recently started as a technician at a music production school in London, where part of my job is maintaining the guitars.

I picked up this 50s parlor nylon the other day and it's in bad shape but I don't know how to go about repairing it.

The main issue is the bridge. The guitar was kept high strung and the bridge has twisted and lifted off slightly at the base. There's about a ~1-2mm gap.
My first thought was to use wood glue and clamp it together, but I'm unsure how to go about clamping it.
I'm hesitant to take it off and reglue like all the videos I've seen have done. Mostly because it's vintage and I'd like to leave as much of it untouched as possible and also because I don't trust myself to replace it properly.

The other significant issue is the 3rd tuning peg, which is much stiffer than all the others and doesn't hold tuning as well.

The lacquer has also cracked, but I'm actually quite fond of the look and would like to keep it that way. My only concern here is if I need to be extra careful using wood glue or other products in case they interfere with the finish.

Do you have any advice on how to go about fixing this?

I also want to lower the action as much as possible. I've done this a few times on acoustic guitars by sanding down the saddle, which will be my approach for this too, unless there's a reason I shouldn't or there's a better way. Either way I'd welcome the advice.

Thanks! Excited to be a part of the group.