Thanks for most of the replies.
Looks like I’ll be giving the Halo products a try before I resort to surgery or disfiguration. Although the vaseline idea will get a trial first this evening
As a baldy I’m accustomed to never being further than 6ft from a buff but I’ve never had any success with sweat management from them. I’ve trimmed them to just a band, doubled them up, tripled them but they never cope for longer than an hour. And 99% of my riding is deep in forests so airflow isn’t a solution.
Still vaguely surprised that none of the big helmet manufacturers have a baldy-man liner version… there’s more than a few potential purchasers around