Dear sir,

I can do nothing better than to refer you to the Association of Amateur Heralds [AAH]. Their web-site can be found at << http://amateurheralds.org/ >> and design assistance is via the application form to be found at << http://fs3.formsite.com/amateurheralds/designrequest/index.h... >>.
The AAH have already been responsible for the design of many arms to date including eccleastical ones - see samples at << http://freepages.history.rootsweb.com/~amateurheralds/hoa.ht... >>. If you wish for any further information, please contact the Secretary of the AAH at << aahsec@bigfoot.com >>.

Best wishes in your endeavour.