I mostly like Metechrosis but fully agree some improvements could be made. What I don't want to see is this being made to function with armor better in any way. Stealth can be used for more than just segueing into combat. I feel Sindome already over emphasises combat characters and don't care to see that pushed further. If anything I'd prefer to see some diversification. Like gangs that actively recruit members of various specialties like sneaks and dips and medics and fixers.
I also think that the idea of applying a disguise when you hide if you have metachrosis is fine as long as losing the disguise doesn't negate the stealth bonus. Not all stealth character want to or should need to invest in the disguise skill and relevant stats to get the sneaky benefits of metachrosis in my opinion. However, given how some feel that ponchos are too much and that the game might be improved by removing them, I think it's important to consider if replacing ponchos with metachrosis is a good idea. It might be given the cost and limitations that come with metachrosis.
I do love the idea of removing that tell that tells everyone you have metachrosis so that it is only apparent when being used.
I also love the idea of having metachrosis letting you freely change your skintone. - even to non-standard colors. I've seen that dones via RP and desscriptions/nakeds in the past before skintone was created but I feel the existence of skintone has killed one RP aspect that having metachrosis allowed. Another reason why I personally wouldn't mind if skintone was just removed from the game entirely.
I also think that clothes made of certain material could play well with metachrosis. This may already be a feature but something like diamond weave could be made to not count when considering coverage. Honestly, if this were to be a thing, I think a cheaper more janky material that works with metachrosis would be a good addition to the game. Something like whatever those new color changing ponchos are made of. I also think that some low end off the rack clothing items, both janky and more stylish, would be great additions as I don't like important functionality completely locked behind PCs.
Over all I love the idea of metachrosis and I love that it's not super ideal for most combat characters. I feel that some adjustment could make this into a very competitive option.