Don't know if this is of any benefit, but we did a lot of work on epoxies at uni and we used some of the companies listed below... The first one, Durabond, for instance is rated at 260 deg centigrade, which is more than double the limit of the Devcon, and is also a machinable aluminium putty.

http://www.cotronics.com/vo/cotr/ea_machinable.htm

http://www.cotronics.com/vo/cotr/ca_metallic.htm

http://www.alvinproducts.com/Products/Products.asp?id=2

http://www.keltech.ltd.uk/epoxies.htm
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NSR300R - Why did i ever have a 250...