Not a trackpad, but I think this would be really cool: https://www.amazon.com/Perixx-PERIBOARD-509H-Keyboard-Trackball-Built/dp/B008F77B7U/ref=sr_1_8?dchild=1&keywords=wired+keyboard+with+trackpad&qid=1589476789&sr=8-8

Or this for a slightly smaller form factor:

https://www.amazon.com/Perixx-PERIBOARD-518-Trackball-Rollerball-Scrolling/dp/B00NY3SU4S/ref=pd_di_sccai_5/130-0490381-4343224?_encoding=UTF8&pd_rd_i=B00NY3SU4S&pd_rd_r=c2eef87e-f112-41fc-bef1-32391bd2f379&pd_rd_w=eVuVD&pd_rd_wg=Zxlid&pf_rd_p=e532f109-986a-4c2d-85fc-16555146f6b4&pf_rd_r=10EX1MTRFYK5Z7PHYP93&psc=1&refRID=10EX1MTRFYK5Z7PHYP93

Here are a few with trackpads, first one is Bluetooth, but also USB-C, so could possibly work to get the effect you want:

https://www.amazon.com/Bluetooth-Jelly-Comb-Compatible-Tablet-Black/dp/B07V2GZCMH/ref=sr_1_1?dchild=1&keywords=wired+keyboard+with+trackpad&qid=1589476789&sr=8-1

https://www.amazon.com/sds-Waterproof-Industrial-Keyboard-Interface/dp/B01HRMKUSK/ref=sr_1_2?dchild=1&keywords=wired+keyboard+with+trackpad&qid=1589476789&sr=8-2

https://www.amazon.com/Perixx-10165-PERIBOARD-513II-Professional-Industrial/dp/B005XZU18I/ref=sr_1_4?dchild=1&keywords=wired+keyboard+with+trackpad&qid=1589476789&sr=8-4

https://www.amazon.com/BFRIENDit-Comfortable-Chocolate-Ultra-Slim-KB1430/dp/B075CFV9BR/ref=sr_1_6?dchild=1&keywords=wired+keyboard+with+trackpad&qid=1589476789&sr=8-6

https://www.amazon.com/sds-Waterproof-Industrial-Keyboard-Interface/dp/B01HRMKUSK/ref=sr_1_20_sspa?dchild=1&keywords=wired+keyboard+with+trackpad&qid=1589476789&sr=8-20-spons&psc=1&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUFSUEJLNEsyWjYwWkwmZW5jcnlwdGVkSWQ9QTA5NDIzMjhXSVhESFdXRVZTU0wmZW5jcnlwdGVkQWRJZD1BMDkyOTY5MDNTR1A5UEtEVUozVDImd2lkZ2V0TmFtZT1zcF9idGYmYWN0aW9uPWNsaWNrUmVkaXJlY3QmZG9Ob3RMb2dDbGljaz10cnVl