Replacing the gallery gaskets next week, question about timing components to replace

THE BULL

I would take a bit more time and plan this one out a bit more.

Financially you can find a newer VHR and depending on the shop it might be easier for them and maybe more cost effective on your end.

You can save the old engine and sell it or practice with it.
The newer VHR will have newer pumps, updated seals, less blow-by, etc.

Otherwise from experience of having to take off the rear timing cover, you might want to prepare yourself for any unseen expenses.
Your cam guides will probably be a bit chewed.
Water pump is necessary, might as well a Tstat.
Coolant transfer tube gaskets in case the tech pulls the whole tube while pulling the neck, very likely re-using the gasket will fool you into thinking its not pinched)
I went and got a tube of Nissan sealant as well (you'll need some good sealant for the cover)
Hopefully no VTC issues or slipped phasers.

There is quite a bit of math to do. If a new motor will be closer to the budget for the gallery service, I'd say go with the new motor.