Hello there,
I have read over your project application. to change from mailpoet plugin to mailchimp. Currently, i've adapted with this two, for Mailpoet, i'm using this plugin in my blog : [login to view URL] ..
As for Mailchimp, you could see almost all of my project completed is related with Mailchimp and other autoresponder services.
I will change integration from mailpoet to Mailchimp safely as your requested, import all existing subscriber, change mailpoet form to mailchimp without any design changed.
While i'm sure there's underbid that offer you other thing, i could assure you several thing :
1. I work extremely fast
2. I have over 3 years experience in Mailchimp and Wordpress itself
3. I have current good track record of Mailchimp and Wordpress
4. I make sure everything is integrated safely
For consideration, please take a moment to see my complete profile and reviews from other r client related mailchimp and wordpress
Thank you :)