David, you didnt mention what handle configuration your were shooting for but next time if you wish to preserve some oversized stags popcorn/texture, you might split the block on a V-sled in your bandsaw, then remove material from those fresh sawn inside surfaces to reduce bulk and thickness before pairing again appropriately around your tang. Works well enough for both full-tang and stick-tang setups. Some nice benefits are that you usually end up sawing out a lot of the softer pith on any roll larger than say ¾ diameter and you end up with a more grip- and eye-friendly oval x-section covered in characteristic texture as opposed to rounded-over bland grey surface thats similar to the original shape. No dye can cover that issue in my opinion.
And on topic...I have had good luck with potassium permanganate washes followed by controlled applications of spirit-based leather dyes down in the cracks and crevices. I usually clean the stag with EtOH first, then soak for a minute in hot tap water before brushing on diluted PP. No need to soak, just rinse immediately. It goes on as a crazy magenta color but quickly turns a natural looking range of brown as rinsed. The PP doesnt penetrate but a few thousandths and makes for interesting highlights that match the texture when polished back after drying. The darker leather dyes do their job down in the lows. This can look pretty good after some light sanding and a hand buff with polishing paper.
And theres always Culpeppers in North Carolina
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Below is an example of the above coloring process, before and after, on a simple patch knife idea I straight up stole from MS Lin Rhea 3 or 4 years back. Thanks Lin!