The best replacement for handcuffs is chain handcuffs.

The best alternatives to handcuffs are rated as following:
★★★★★  chain handcuffs
★★★★  smith and wesson
★★  zip ties
★★  hand cuffs
★★  chain
★  manacles

Your alternative for handcuffs is not listed? Suggest!
Speaking about handcuffs, one probably shouldn't forget about belly chain.

Other search terms related to handcuffs and their ratings are:
★★★★★ belly chain
You have in mind a companion for handcuffs and it is not yet here? Propose!



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handcuffs
chain handcuffs
smith and wesson