Absolutely. The Twist n Lock is simply referring to the pump
which can be closed by twisting the handle. I have rebuilt my two heads and replaced pumps
(just before the TnL came out...6 months ago) and it's not much of a deal. Though it can be a touch messy as many will agree.
You can get the retrofit kit, bang it in in a matter of 30 minutes and remember to cover the joker and valve under the pump
in silicone grease. I don't think the TnL will protect the joker valve though - the risk to the joker is that it inverts in the pipe when the flow is not right and you then get the nasty stuff flowing back.
Being based in the tropics I have learned from older salts that the joker valve lasts longer if protected by silicone grease. Expensive, but apparently one should avoid petroleum products as it will, over time, harden the rubber.
I keep a couple spare joker valves onboard, just in case.