If you need to bring in your entourage, forget about the usual free 2 times per annum versions (eg dbs altitude, citi PremierMiles etc)
Get the SCB Priority Banking Visa Infinite (Blue version. Not brown)
If you have less than 200k (including home loan), you get 4 visits. >200k,you get 24 visits.
Alternatively, you and your spouse apply for the citi PremierMiles and you'll have access for 4 per annum. And if you both apply for dbs Altitude as well, that's access for 4 on another flight.
For unlimited entries for 2 (with hefty annual fees $500+), get the hsbc visa infinite or citi prestige Mastercard. Citi Prestige unlimited entry allows to sign in one guest. Hsbc vi is slightly different, it issues your supp card a priority pass card for unlimited entries.
Alternatively, open an account with dbs Asia Treasure, you get lounge and airport transfer.
You'll have to work out the combination that suits you and then go float that boat.
My 2 cts, conserve your priority pass access overseas where your access will really count as the airport options can be dire or if you're stuck at an airport due to flight delays. Changi has excellent alternatives to priority pass lounges unless your flight ticket is in the forward cabin where airline lounge access is a given.