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You could make your own full-aperture solar filter using a piece of cardboard mailing tube or PVC drain pipe as the shroud (big enough to fit over the open tube), and then either fit a ready-made solar filter over the front end, or else make your own filter using solar film.
You'd probably need to slot the tube to fit around the eyepiece / focuser, and you'd want to seal the slot with a flap or similar to be safe, but it shouldn't be rocket science (pun intended!) to come up with something that works.
However, if you're not confident with your ability to make a 100% light-sealed tube with no chance of leakage, I wouldn't try it - the consequences of stray sunlight hitting your eye are too dire.
If you are keen to do some casual solar observing, remember that high power / light-gathering aren't really necessary. (You're trying to restrict the amount of light collected, not increase it!) You could buy a cheap closed-tube scope (such as the Heritage 76, or a 50 mm / 60 mm "department store" refractor) and make a filter for it. See the attached photo - the blue and black object is a solar filter that I made from cardboard, masking tape and solar film - works a treat!
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