On my NSR i have one of these delimiters but not cause i wanted to delimit the ignition with it.
It was a part of a used ignition kit which i bought for my NSR some years ago.
The kit was SS-SP (NKD) which includes unleaded HRC PGM-III (CI1605E) and a race loom with the delimiter been a part of it.

For a simply de-restriction i would follow the wire splice,the HRC box doesn't worth the effort and money.

The HRC box does exactly the same job as the wire splice but with a tricky (hidden) way under a plastic case.
Below is a photo of an uncovered HRC delimiter which you can see very easy how it does the (black-orange) wire splice.


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Owner of : Honda NSR250 MC28 95sp colours / Honda NSR250 MC18 R6K SP / Honda RS250 NF5 89 in boxes / Honda C50 12V cub / Honda C50 12V super cub Japanese version /Yamaha XT600 89 benetton