Do you have, or could you find a source of sheep or rabbit bedding? Seriously-- call a few pet stores. Both can be hoed/ tilled into the soil or into the built up soil for raised beds w/o burning up your plants, like most uncomposted manures do. Fish emulsion is a fairly low-cost and highly effective amendment.
I am in a similar boat-- left our wonderful compost heap behind and moved to a lot of long-fallow ground. I'm interested to read some of the replies you get and Thanks! to all the posters!
(OH! Tomatoes LOVE rabbit litter! LOVE IT! idk why)
We've done square foot gardening (w/o all the intensive double-digging-- just tilled, framed-- or not-- and added extra soil, sometimes bagged soil, and aged bagged manure and fish em) w varying success-- usually pretty good. Before you begin, I'd recommend kneeling and measuring how far you can comfortably reach to weed/ harvest, etc w/o stepping on your bed bc a 4 x 4 square is too big for many women, LOL.
Let us know how it goes-- post pix maybe?
blessings-- I hope your garden is wonderful!