Can you just let it ramble along the floor? If not, any sturdy structure could be fashioned into a support. I've used an aluminum ladder, a plant stand, old book shelf, or you can build one from wire mesh & rebar. I'm growing butternut squash and nothing is strong enough to support those so it just rambles along the ground like pumpkins. It doesn't seem to mind.

welcome to GoY.

I have 1" diameter bamboo canes in the ground with netlon rigid plastic [2" grid] netting stretched across it. The cucumber will self cling as it has tendrils and this will keep the fruits off the ground. less likely to be nibbled by slugs and snails.