A 2009 MacBook Pro is basically 17 years old at this point. Is it not reasonable to upgrade to a newer model now?
How long were you expecting it to last?
For a fairly cheap alternative, and if you want to stay with an Intel Mac, a 2019 or so Mac would work can run the most current macOS version. Unless you need the portability of a laptop, a Mac Mini or older iMac may work at a lower price. Under $300 for these on eBay and the like.
Also, at that age you're likely still running 32 bit apps, so you may want to start looking for app replacements that can work on newer macOS versions.
For the iPad Pro, the oldest it can be is a 2015 model. 2020 models can be bought for fairly cheap these days (around 200 to 300 bucks) and can still run the current iPadOS version.
Outside of newer devices, your options are extremely limited. You won't one able to simply force software to work on old hardware.
If you do choose Ebay, make sure the Macs and the iPads are correctly restored and ready to set up again, otherwise you may encounter activation lock.