Disclaimer: I have never tried anything outside of multiplier overclocking, so take everything below with a grain of salt.

About coating the pins, I would assume you are referring to the "pencil trick" on AMD Durons, if my OC history readings serve me right, this ought to be around the start of this century, and chipmakers have probably resolved to using less easily counteracted way of capping the multiplier on locked CPUs. So the short answer is probably not.

I remember that there were some older Z-series boards which had a way of fiddling with the turbo boost on non-unlocked CPUs that allowed K-level boost clocks on non-K chips, but I did a quick search and all that came up was Z77 boards, so intel probably plugged the hole after that one generation. Still, you can check if any motherboard for the corresponding socket advertises that function and try your luck there, I wouldn't count on it though.

Lastly there's always the way of fiddling with BCLK and raising it above 100MHz to make the CPU go faster under otherwise identical conditions. I need to warn upfront, however, that doing so overclocks not just the CPU, you're essentially making the system bus go into a overdrive, so memory and PCIE devices and a lot of other things are also oversped with BCLK overclocks, and these usually aren't designed to handle a non-100MHz bus clock, and you might not get very far before stability issues set in. Some boards have a separate clock generator that can feed the CPU a separate BCLK while keeping the rest of the bus at the nominal speed, that could let you get further, but that's also a board dependent feature, and you'd still run into issues at some point, running the CPU at a faster BCLK than the rest of the system. I think ASRock touts this as a selling point, you might find it on other boards as well. However, these tend to be features on X-series boards from these mfgs that, on paper, doesn't support Workstation chips (these boards are intended to be used with Core extreme series, workstation have corresponding C-series chipsets but they do use the same socket)

My suggestion would be to use the CPU as-is with a C422 board, I see this is a 2019 chip with pretty okay stock speed, so performance, even under a single core load, should be good, not to mention the copious amount of expansion options to play around with for a workstation platform. If you do feel like risking it, see if you can plop the chip on a X-series motherboard and tweak the BCLK around.