My guess is that the Timney or Rifle Basix Sav-1 would be a better fit for you (and a lot cheaper than the Jard).
You will need a trigger hanger in addition to the newer style sear and safety bar.
As far as the "milling" the guy in the post i linked actually used a die grinder to make clearance on the side of the receiver. As i mentioned i tried to bend one once and broke it (the heat treating is done after it is formed). But i have heard of others having success bending it, but they may have heated it.
Its been a while since ive done this.
I gave the last one i had to a grandaughter and cleaned up and reworked the pre-1966 trigger. It breaks at just under 3#. She has killed 3 or whitetails & a bear with it!
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