You may want a WCMT but considering the cost of the wrap and then the conversion it maybe out of your budget. This blog (http://www.fineandfairblog.com/2013/10/tablecloth-mei-tai-tutorial-with-wrap.html?m=1) includes a tutorial which demonstrates how you can make your own Mai Tei carrier, with wrap straps, from a tablecloth. There are many other tutorials available online which offer instructions for similar projects.
NB: I have not personally used this tutorial. As with the making of any baby carrier, please ensure the finished item is safe for purpose.