Whats the WMD Metron like? https://www.modulargrid.net/e/wmd-metron Should be OK for Gate length. You can also slow-clock a sequencer for an extended gate time, a really simple module for this would be the Noise Engineering Bin Seq if you want fairly fixed or manually tweaked gate times. https://www.modulargrid.net/e/noise-engineering-bin-seq
Enjoy your spare HP, don't rush to fill every last space, this is not like filling sticker books. Resist the urge to 'complete' your rack, its never complete so just relax.