You may want to take a look at something like this.

MIDImitter http://www.s-r-n.de/midile/

or this. iConnect MIDI2 plus https://www.iconnectivity.com/products/midi/iconnectmidi2plus/

If you are using the Mac, you can just use lightning to usb connector from the iPad to your Mac. Once connected, open up Audio MIDI setup on your Mac. In Audio MIDI setup, you can look at Audio devices, and then Enable the iPad, which enables Inter Device Audio and MIDI Mode, giving you 16 Channels of bidirectional MIDI, as well as an additional 2 for the iPad itself, as in this mode it becomes a class-compliant MIDI device. To send MIDI to the iPad from your M1, you can direct it to the IDAM channels.

Another option in Audio MIDI Setup is the Network Session, which you’ll find on the MIDI devices section. You can Enable a Network Session there, then select your iPAD to Connect to the Session, which the MAC hosts, network session works over USB, wireless, and Ethernet, with 16 channels of bi-directional MIDI per session (can create multiple if you need).Any synth on the IPad will see the both network session, and the IDAM channels, allowing you to send MIDI between your 3 devices as you like.

Both of these should work, and won’t cost anything

The network option sounds great thanks. Is there much latency though?

With the first option, I’m struggling to understand how all three devices can be connected. Connecting ipad to mac - get that. It’s connecting the keyboard to the ipad that I dont get.