Try BTCPay Server's coinjoin plugin instead of Whirlpool.  It's uses an upgraded protocol that's MASSIVELY cheaper, and you can make EVERY spend a coinjoin, without revealing common input ownership or creating toxic change -
 nostr:nevent1qqs2lypcwr8d2rjcawh5a534pfq3marffrt5eqawdlurcgt0cqqh27gppamhxue69uhkummnw3ezumt0d5pzpywf5hs6jazpznr0uttp4ex7sf3fa24qldf0fq5gpy78ulsrd7pjqvzqqqqqqyvu22vn