Q: Will This cover my mortise lock dead bolt and lever area so I can convert to a cylindrical lock using the the mortise conversion plate?
A: Thank you for the images. first I would start off by saying that I would encourage you to replace that mortise lock with another mortise lock and my reasoning is as follows. The mortise lock that you have there (from Russwin pre Corbin merger in 1993) is easily from the 1980s and I'm going to imagine has worked flawlessly for decades. Mortise locks are extremely robust pieces of equipment and far superior to any cylindrical lock. While it is most certainly true that mortise locks are more expensive when compared to their grade 1 counterpart I would say that the additional years of service allow you to amortize the cost vary that officially.
Having said this, what you want to do is actually a very common process and here are the parts that I would recommend that you use:
First you will remove that mortise lock and you will install into the edge of the door the
Hager 336N Latch Adapter Filler Plate
as seen here:
Click Here
Second you would install in the frame the
Cal-Royal ASAST US26D Steel Template ASA Strike - Satin Chrome
as seen here:
Click Here
Lastly you are going to need two each of the
Don-Jo RP-13515-2 630 Satin Stainless Steel Remodeler Plate
as seen here:
Click Here
I liken this process to dental work meaning there are times when you need an implant but a bridge is a less costly option. Converting a mortise lock to a cylindrical lock is opting for the bridge.
my final comment would be as if your volume of use and the walk is moderate to low I would not be necessarily hesitancy to proceed with this change however if this is a fire-rated door all of the above mentioned outline how to convert the mortise to a cylindrical lock would be technically in violation of established building code ( or at least one code references NFPA 80) because the parts I've suggested above are not fire rated and approved for use on fire assemblies. The door may be exterior but it may not be because I do not see any weather stripping, I can see pails stored on the pull side of the opening, I do not see a latch protector, other hardware that may conclude that this is an exterior door along with what appears to be an epoxy floor.
I'm very grateful to be a part of the conversation and feel free to keep the questions coming.