John
Welcome to the community.
I cannot answer the question on shielding but depending on the depth of the HB on that guard you may have to make some adjustments, so check the specs and measure your cavity depth.
I changed my old Affinity from SSS to HSH some years back, It was a tight fit and I had to drill some counter sinks for the pups height adjusting screws. The write up of the project is in my Learning Log which may help but you look to be taking an easier route !
https://community.justinguitar.com/t/the-madmans-learning-log/3938
Its part 2 of 47 as the info cam across from the old forum.
Why not introduce yourself to folks here
https://community.justinguitar.com/c/community-hub/introduce-yourself/263
Plenty of folks around for advice and support.
Cheers
Toby
