The Osmo is a tinted hard wax oil, £1.55 is the tester pot, you would probably need at least 750ml.
I used this for our Oak staircase but it is only a clear hardwax oil https://www.screwfix.com/p/liberon-2-5ltr-clear-matt-water-based-interior-wood-wax-oil/5182F?tc=FG5&gad_source=1&gad_campaignid=19822796129&gbraid=0AAAAAD8IdPyfxoaSUDUU9N6sIoqNBYRgI&gclid=CjwKCAjwravBBhBjEiwAIr30VLFGRXRiOfoQw-4XwR_sOfw9x3ltS-3vlHjbnfhyBgNqLgju60l56xoC-rIQAvD_BwE&gclsrc=aw.ds
I think going to Brewers or a another paint center (hopefully you will get somebody helpful) and asking them for options, take a offcut so they can see what you are trying to do, you will need to think about what colour and finish you want.