That R&K is very good stuff, it flows better for me than Ecclesiastical Stationery Supplies ink. Diamine offers some, too, along with the Chesterfield Archival (same juice?). Most of mine are vintage and getting hard to find reliably these days -- Montblanc's offering in Midnight Blue was iron gall up until about a year or two ago, sadly.
Recently, I bought two bottles of Hero blue-black 232 which turned out to be a really impressive product! And inexpensive. I tested it in several vintage lever fillers before putting it into a couple of Pelikans ... no problems.
It's out there on eBay for under $10 with shipping, it was a lot cheaper when we first discovered it. Make sure it looks like that bottle.
I love IG inks! Well-behaved, somewhat dry, and especially permanent. As far as the worries go, I treat 'em as I would any normal ink.
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Looking for Iron Gall ink.