I wear braces but my saw trousers also have belt loops. I make use of the loops in various ways, one being a secondary attachment point for a 1st aid kit. No reason for me to be bothered about attachment in this manner, as I don't climb trees with a saw, so the kit is not obscured by a harness or ropes, etc.
All my personal 1st aid kits, except one, has started out as a basic bag for the intended activity. Then has be modified and or been added to, as I've seen fit. So my kits have paracetamol amongst other mods. I'm fully aware, that it would be ill advised to administer them and or a cream I may carry to someone else. But I carry them, as I may well use the kit for the benefit of my 'own' health. Not every need for 1st aid will require I whip out multiple large wound/field dressings. I may just need a padded plaster to ease chafing on a finger or other, until I can do something more effective and longer lasting.
Good sense has a hand in 1st aid. You don't suck a finger injury, as you could well contaminate the injury or swallow something unsettling or maybe get a metal splinter in your mouth. But no body's suggesting you don't take/produce saliva.
My rock climbing kit is mainly bandages and plasters but there's other stuff too. My cycling kit has a number of ordinary plasters and blister plasters too but that's not its only content. Paddling kits are fitted out for either touring or ww. The one I carry in the car, is 90% bandages and lots of them.
If I carry a rucksack, there's a 1st aid kit suitable for the intended main activity or for minor & general injuries in the case of my day-sac. I attended the arb show, took my day-sac and in one of the side pockets, was that sac's 1st aid kit. All my 1st aid kits have various plasters, bandages, steri-strips & a re-sus aid as a minimum.
The HSE can dictate certain things in a workplace. What else I add and whether I choose to administer them, is up to me. If you're afraid of coffin-chasing-lawyers, I suggest you leave helping people/animals to others. You can still be supportive & helpful, without having to touch a living/recently deceased soul. But even being a designated 1st Aider, does not obligate you in law to help others. If you choose to, you do; if you choose not to, you do not.