Ah, you should do it! And splitting the cost is a great idea.
I SORN the car in the winter and keep it in our garage but this summer I have done Donington, Castle Combe, Oulton Park and Thruxton.
I’ve done most of the UK circuits now as well as Spa and The Nordschleife.
But you should do it. You won’t regret it honestly.
Let me know if you want to chat it through as it took me a while to convince myself