I'll be arriving in Lima, Peru on Avianca Business from Bogota and then I'll have a 5 hr transit before flying to Cuzco, also on Avianca but on Economy.
I would like to know if its possible to use the Avianca Lounge upon arrival in Lima to use their shower facilities (if there is one?) before exiting/going through immigration as I think I would have to check-in separately for the Avianca flight to Cuzco on Economy.
I will not have any checked-in luggage, only handcarry backpack.

Otherwise my other option is to exit upon arrival and then use the lounge after i do the check-in for the Cuzco flight?
However I think the Cuzco flight is in the domestic terminal so I'm not sure what lounge facilities is available? I'd just like to be able to take a shower & change after coming in on a long flight....

Any thoughts/advice will be appreciated! Thanks!