I no expert mate but from what I understand the simms are written in a compleltly different way, ie they are identified to work with the specific item of hardware, and nothing else............will of course stand corrected if someone else knows more.
As for your problem, have you considered a UPS, I got a medium size el cheapo one 1000VA from ebay for around $250 posted, and it can run my network (ie just the modem and the routers etc) for around an hour or so.
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