Peep sight options for a 1956 Winchester 94|Winchester Sights|Forum|Winchester Collector

Greetings from the UK! I’m about to have some work done on my recently-purchased Winchester 94 in 30-30, serial 22783XX, which makes it a 1956 model, I think? Although the rifle itself has seen very little use (a perfect, shiny bore and very good bluing) a previous owner has sanded the stock, reshaping the comb and ruining the wood to metal fit. I’ve bought a semi-finished stock set from the US, and will be handing the gun over to my gunsmith for this work and a new hammer spring (he makes his living finishing English sporting guns so I’m expecting a rather better result on my stock than I could achieve myself!). 

I need to fit a peep sight for my 40-something eyes but I’m unsure which way to go. The new aluminium Lyman 66a’s have a poor reputation, but I’m not that keen on the older steel 66a either (spoils the lines of the gun visually to my eye). The more elegant Lyman 56a is expensive everywhere, tricky to source in Europe and I’ve never looked through one so can’t judge how good a tool it might be. The Lyman tang sight is available and reasonably-priced but requires the tang to be drilled and tapped, which would be a modification of no return… 

What’s authentic, what works best?