Cement to patio wooden handicap ramp "Rustic" or "Something out of Ponderosa"

I've built a handicap ramp for my neighbor who wants it to look "cowboy" or "ponderosa-ery".Haha. Gauntlet thrown down, gauntlet picked up. Challange accepted. I love my retired veteran neighbor, I sort of became his handyman and when he asked me if I could make him a wooden handicap ramp I said "I think I can do that." What a learning curve I went through. There's a lot that goes into building a wooden outdoor wheelchair ramp.

Anyway, he had me take out some old garden fencing that had some awesome weatherd features and colors.

So I lightly sanded a couple arm loads of them and placed them on top of the plywood,glued them down before screwed down

and gave them a couple coats of rejuvenation oil and boiled linseed oil.

The colors came out great. So my question is, what type of stain/sealer should I use to protect this older wood from the elements,wheelchair use(occasionally)
and handle people walking/running up and down it? I'd like to keep the wood color if possible... any advise would be GREATLY appreciated. Thanks 😁