I find the concept interesting, but I recognise that my own motivation and knowledge of linguistics are significantly short of where they would need to be to make a conlang myself. I have played around with around with VulgarLang a fair bit, which allows me to fake a conlang to my design juuuust enough to do the job for the purposes of tabletop RPGs and such.
Does Silbo Gomero qualify as a conlang? It was made by adapting a way to speak the Guanche language through whistling into Spanish, but I'm not clear enough on the origins of it to know how "constructed" it is. I suppose it can also be considered to just be a version of Spanish. If it does count, it's my favourite