If you cannot get a mica shield, (mica is a natural mineral that is in clear sheets, like flexible glass, being a mineral it is fireproof), from Litho123 then you can get just about any type of heat shield material from an electric supply or electronics outfit. There is made some cheap tapes for this. A sliver of shield between the bulb and slug is all that is needed.
I have modded a MC from the 1160, great first upgrade, white light about 400 lumens, to brighter 7.2 volt systems. The brighter bulbs require you insulate the reflector. I found it could be done by popping the reflector out of the plastic frame and putting in 4 thin pads of of fiberglass felt, used in auto body repair and available cheap from retail auto supply shops including walmart, bondo brand is common. Gluing it in is a trick. Super glue works. The problem is fuming from the heat of the bulb.
7.2 volts require different custom battery packs and a modified charger. But then you can run wa1111 at 550 lumens or phillips 5761 at 896 to over 940 lumens which most people do not realize is brighter in many applications than the beloved wa1185. The 1160 and 1111 are not very hot and only need the mica shield. The 1185 and 5761 require insulating the stock reflector if you use extended run times or buying the FM reflector; they are hot bulbs. The stock reflector or smooth reflector has more throw than stipple or orange peel reflectors but will show bulb element shadows, called artifacts. Bulb etching with glass etching will frost a bulb and give a smooth hot spot.
Your best bet is the 1160, a little bit of shield on the slug and an upgraded battery pack, greater capacity. A nice easy upgrade is to get some glass etching from a hobby shop and frost any bulb, from the bottom up to a point just past the element, leave the top clear. This will give a beautiful smooth appearance to any output.
You have picked a very nice gift to give to someone. You may just start someone down the road to flashaholism.