I was thinking of going with something notably MoC or CC, rather than FedSuns (as most of our initial 'Mechs were) or "generic merc" (the second group of 'Mechs); something to tie them more to their adopted homeland (Canopus)--or, by extension, the CapCon.
Looking through Handbook: Major Periphery States I can see that Majesty Metals and Manufacturing produces
Shadow Hawk, so you should look this way. We do not know what variant is produced there, but TRO: Project Phoenix says that House Liao bought license rights for SHD-7M to produce it for their armed forces and their Magistracy allies. So it's possible that Capellans sublicensed SHD-7M to Canopians. Capellans did the same deal with Taurians already.
We should consider the possibility that Majesty Metals retooled their manufacturing line during Jihad. Then they could produce SHD-8L, if Capellans provided them with blueprints. It is a 'Mech similar to original
Raijin, equipped with BAP and ECM, armed with Plasma rifle, MML-5 and Medium Variable Speed Pulse laser.
Both RPE and IWM offer miniature.
Griffin offers two variants. In addition to GRF-4R (which I mentioned earlier), you could look at GRF-5L produced by Capellans. Stealth variant with Plasma rifle and three Medium lasers doesn't look bad.
Both RPE and IWM offer miniature.
For distinctive Canopian/Capellan 'Mech you can check
Eyleuka EYL-45A/B which is produced on Detroit.
Both RPE and IWM offer miniature.
Wolverine WVR-9W2 is another possibility. However, it lacks concentrated punch because its primary weapons are a pair of Light PPCs. I feel I should mention this 'Mech, but aforementioned
Shadow Hawk, Eyleuka or
Griffin are much better choices.
Both RPE and IWM offer miniature.
Phoenix Hawk PXH-4L and PXH-5L isn't bad, but both models are a bit light on armour.
May I ask why you just do not buy
Raijin II miniatures from IWM?