RE: need advice
Yup, you can change a string on a recurve crossbow in the field but.....IN 40+ years of seriousbow hunting I have NEVER had to change a string on a bow in the field,NOT on a recurve, longbow, or crossbow. Using that as a reason to choose a recurve over a compound isn't anywhere near a vaild reason.
Choosing a crossbow is likechoosing a pair of good boots; Pick the one that fits you the best!